Java

Valentinor8-Jul-22 19:32

Valentinor

8-Jul-22 19:32

I'm using jdk1.8.0_333 / jre1.8.0_333. Do you know if this is a problem or not? Or I need to try to switch to a new version to be free? I'm not really going to make money from my first release, so I would like to try to keep it free.

Also I've seen that there is another source for Java: OpenJDK[^] / OpenJDK JDK 18.0.1.1 GA Release[^]. Is this one free, while the one from Oracle you need a subscription but contains some more advanced features/libraries?

Dave Kreskowiak8-Jul-22 19:40

Dave Kreskowiak

8-Jul-22 19:40

For the definitive answer that's going to deal with money, the ONLY people you should be asking this question of is Oracle Support.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Valentinor8-Jul-22 21:51

Valentinor

8-Jul-22 21:51

Because this is a issue that can lead to financial/law problems I took a look at JDK's and I found Adoptium[^]. Do you know if this is free for commercial use? I see that they have JDK and JRE. I will try to contact them as well, but for sure it will take quite a long time before they respond.

Dave Kreskowiak9-Jul-22 5:43

Dave Kreskowiak

9-Jul-22 5:43

I don't do Java.

The only reason I know about the licensing is because of the licensing requirements at work.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

solve the error

Member 156672428-Jun-22 21:02

Member 15667242

8-Jun-22 21:02

public class student{
private int ID;
private String Name;
Student class constructor
student(int id, String name){
this.ID = id;
this.Name = name;}
public int getid(){
return this.ID;}
public String Getname(){
return this.Name;}
public void SETid(int i){
this.ID = i;}
public void sETNAme(String n){
this.Name=n;}
method to display data
    public void display() {
System.out.println("Student id is: " + id + " "
     + "and Student name is: "
 + Name;);
 System.out.println();
}}

Richard Deeming8-Jun-22 21:19

Richard Deeming

8-Jun-22 21:19

No.

Even if you'd asked nicely, you haven't bothered to tell us what "the error" is.

Dumping your code without explanation and demanding that someone "solve the error" is a great way to alienate people, and ensure nobody wants to help you.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Richard MacCutchan8-Jun-22 22:56

8-Jun-22 22:56

Let's start by formatting the code and adding ;line numbers so it is actually readable. You can now clearly see that at the very least you have invalid lines at lines numbers 5 and 22. I assume these are supposed to be comment lines so require a "//" at the beginning. You also have mixed capitalisation on your setters and getters.
So start by fixing those and see what happens.

Java

  1  public class student{
  2      private int ID;
  3      private String Name;
  4  
  5      Student class constructor
  6      student(int id, String name){
  7          this.ID = id;
  8          this.Name = name;
  9      }
 10      public int getid(){
 11          return this.ID;
 12      }
 13      public String Getname(){
 14          return this.Name;
 15      }
 16      public void SETid(int i){
 17          this.ID = i;
 18      }
 19      public void sETNAme(String n){
 20          this.Name=n;
 21      }
 22      method to display data
 23      public void display() {
 24          System.out.println("Student id is: " + id + " "
 25              + "and Student name is: "
 26              + Name;
 27          );
 28          System.out.println();
 29      }
 30  }

Sakshi Jain 202226-Jun-22 20:59

Sakshi Jain 2022

26-Jun-22 20:59

You forget to add // on commenting lines that is in line number 5 and 22

Java

public class student{
    private int ID;
    private String Name;

    //Student class constructor
    student(int id, String name){
        this.ID = id;
        this.Name = name;
    }
    public int getid(){
        return this.ID;
    }
    public String Getname(){
        return this.Name;
    }
    public void SETid(int i){
        this.ID = i;
    }
    public void sETNAme(String n){
        this.Name=n;
    }
    // method to display data
    public void display() {
        System.out.println("Student id is: " + id + " "
            + "and Student name is: "
            + Name;
        );
        System.out.println();
    }
}

Richard MacCutchan26-Jun-22 21:41

26-Jun-22 21:41

See my answer of 9th June above.

Runnable as a new object?

Peter_in_278026-Jun-22 22:19

Peter_in_2780

26-Jun-22 22:19

He already did, when he cut'n'pasted it

Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012

Member 156629325-Jun-22 13:24

Member 15662932

5-Jun-22 13:24

Hello. I'm new to Java -- I want to learn, and am going through HFJ. I know it's an old book, but there are no later editions, so I may be behind the times.

I'm not a professional programmer, but I'm on a few programming forums, and I can't seem to get an answer to a question I have regarding the Runnable interface. I'm in chap 15 of the book re: threading, and I came across this statement in regards to starting a new thread:

public class MyRunnable implements Runnable

Runnable threadJob = new MyRunnable ()

What I don't understand is how can you make a new object with an interface, but use the class MyRunnable. Shouldn't it be MyRunnable thread = new MyRunnable ()?

I'm just confused. Runnable isn't a class, so what's going on?

Re: Runnable as a new object?

Richard MacCutchan5-Jun-22 21:27

Re: Runnable as a new object?

5-Jun-22 21:27

See Runnable (Java Platform SE 7 )[^] and Initial Threads (The Java™ Tutorials > Creating a GUI With Swing > Concurrency in Swing)[^] for full details of this interface.

Gerry Schmitz6-Jun-22 13:47

Gerry Schmitz

6-Jun-22 13:47

Any class can be "cast" to an interface that it implements; or it can be cast to any object it is "derived" from (e.g. "object").

In your example, a new MyRunnable is created and implicitly "down cast" to Runnable.

The interface acts like a proxy for all (different) classes that implement that interface; allowing only access to the properties / methods identified via the interface.

"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I

Re: Runnable as a new object?

englebart7-Jul-22 16:10

englebart

7-Jul-22 16:10

In C++ terms, a Java interface is a pure abstract class that only has member functions. No fields.

Fields on interfaces are always “constants”. (This is an older Java rule)

It is closer to the COM interface concept.

It could also be called an API contract.

An object can implement multiple interfaces.

This is an easy way to create delayed binding. The thread library was written decades ago, but you can create an Object today that will be usable by this old library as long as you honor the contract defined by the library. For Runnable, you must provide the run() method. The live Thread object will then invoke your run() method when you get your plumbing code correct.

Connect morpho biometric device with jav

Member 156609363-Jun-22 3:10

Member 15660936

3-Jun-22 3:10

connecting morpho biometric device with java in netbeans 8.2 and i want source code

Re: Connect morpho biometric device with jav

Richard MacCutchan3-Jun-22 9:06

issue starting my ksql-server

3-Jun-22 9:06

Sorry, this site does not provide code to order.

james michael May202225-May-22 13:20

james michael May2022

25-May-22 13:20

hi am having following issue when starting kafta

 confluent local services ksql-server start
The local commands are intended for a single-node development environment only,
NOT for production usage. https://docs.confluent.io/current/cli/index.html

Using CONFLUENT_CURRENT: /tmp/confluent.122197
ZooKeeper is [UP]
Kafka is [UP]
Schema Registry is [UP]
Starting ksqlDB Server
Error: ksqlDB Server failed to start
kafta@kafta-VirtualBox:~$ confluent local services ksql-server log
The local commands are intended for a single-node development environment only,
NOT for production usage. https://docs.confluent.io/current/cli/index.html

OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
[2022-05-24 11:22:13,133] INFO KsqlConfig values:
        ksql.access.validator.enable = auto
        ksql.authorization.cache.expiry.time.secs = 30
        ksql.authorization.cache.max.entries = 10000
        ksql.cast.strings.preserve.nulls = true
        ksql.connect.basic.auth.credentials.file =
        ksql.connect.basic.auth.credentials.reload = false
        ksql.connect.basic.auth.credentials.source = NONE
        ksql.connect.error.handler = null
        ksql.connect.request.headers.plugin = null
        ksql.connect.url = http://localhost:8083
        ksql.connect.worker.config =
        ksql.create.or.replace.enabled = true
        ksql.error.classifier.regex =
        ksql.extension.dir = ext
        ksql.headers.columns.enabled = true
        ksql.hidden.topics = [_confluent.*, __confluent.*, _schemas, __consumer_offsets, __transaction_state, connect-configs, connect-offsets, connect-status, connect-statuses]
        ksql.insert.into.values.enabled = true
        ksql.internal.topic.min.insync.replicas = 1
        ksql.internal.topic.replicas = 1
        ksql.lambdas.enabled = true
        ksql.metastore.backup.location =
        ksql.metrics.extension = null
        ksql.metrics.tags.custom =
        ksql.nested.error.set.null = true
        ksql.output.topic.name.prefix =
        ksql.persistence.default.format.key = KAFKA
        ksql.persistence.default.format.value = null
        ksql.persistence.wrap.single.values = null
        ksql.persistent.prefix = query_
        ksql.properties.overrides.denylist = []
        ksql.pull.queries.enable = true
        ksql.query.cleanup.shutdown.timeout.ms = 30000
        ksql.query.error.max.queue.size = 10
        ksql.query.persistent.active.limit = 2147483647
        ksql.query.persistent.max.bytes.buffering.total = -1
        ksql.query.pull.consistency.token.enabled = false
        ksql.query.pull.enable.standby.reads = false
        ksql.query.pull.interpreter.enabled = true
        ksql.query.pull.limit.clause.enabled = true
        ksql.query.pull.max.allowed.offset.lag = 9223372036854775807
        ksql.query.pull.max.concurrent.requests = 2147483647
        ksql.query.pull.max.hourly.bandwidth.megabytes = 2147483647
        ksql.query.pull.max.qps = 2147483647
        ksql.query.pull.metrics.enabled = true
        ksql.query.pull.range.scan.enabled = true
        ksql.query.pull.router.thread.pool.size = 50
        ksql.query.pull.stream.enabled = true
        ksql.query.pull.table.scan.enabled = true
        ksql.query.pull.thread.pool.size = 50
        ksql.query.push.v2.alos.enabled = true
        ksql.query.push.v2.catchup.consumer.msg.window = 50
        ksql.query.push.v2.continuation.tokens.enabled = false
        ksql.query.push.v2.enabled = false
        ksql.query.push.v2.interpreter.enabled = true
        ksql.query.push.v2.latest.reset.age.ms = 30000
        ksql.query.push.v2.max.catchup.consumers = 5
        ksql.query.push.v2.max.hourly.bandwidth.megabytes = 2147483647
        ksql.query.push.v2.new.latest.delay.ms = 5000
        ksql.query.push.v2.registry.installed = false
        ksql.query.retry.backoff.initial.ms = 15000
        ksql.query.retry.backoff.max.ms = 900000
        ksql.query.status.running.threshold.seconds = 300
        ksql.query.transient.max.bytes.buffering.total = -1
        ksql.queryanonymizer.cluster_namespace = null
        ksql.queryanonymizer.logs_enabled = true
        ksql.readonly.topics = [_confluent.*, __confluent.*, _schemas, __consumer_offsets, __transaction_state, connect-configs, connect-offsets, connect-status, connect-statuses]
        ksql.rowpartition.rowoffset.enabled = true
        ksql.runtime.feature.shared.enabled = false
        ksql.schema.registry.url = http://localhost:8081
        ksql.security.extension.class = null
        ksql.service.id = default_
        ksql.shared.runtimes.count = 8
        ksql.sink.window.change.log.additional.retention = 1000000
        ksql.source.table.materialization.enabled = true
        ksql.streams.shutdown.timeout.ms = 300000
        ksql.suppress.buffer.size.bytes = -1
        ksql.suppress.enabled = false
        ksql.timestamp.throw.on.invalid = false
        ksql.transient.prefix = transient_
        ksql.udf.collect.metrics = false
        ksql.udf.enable.security.manager = true
        ksql.udfs.enabled = true
        ksql.variable.substitution.enable = true
        metric.reporters = []
        ssl.cipher.suites = null
        ssl.enabled.protocols = [TLSv1.2, TLSv1.3]
        ssl.endpoint.identification.algorithm = https
        ssl.engine.factory.class = null
        ssl.key.password = null
        ssl.keymanager.algorithm = SunX509
        ssl.keystore.certificate.chain = null
        ssl.keystore.key = null
        ssl.keystore.location = null
        ssl.keystore.password = null
        ssl.keystore.type = JKS
        ssl.protocol = TLSv1.3
        ssl.provider = null
        ssl.secure.random.implementation = null
        ssl.trustmanager.algorithm = PKIX
        ssl.truststore.certificates = null
        ssl.truststore.location = null
        ssl.truststore.password = null
        ssl.truststore.type = JKS
 (io.confluent.ksql.util.KsqlConfig:376)
[2022-05-24 11:22:16,956] INFO KsqlRestConfig values:
        access.control.allow.headers = []
        access.control.allow.methods = []
        access.control.allow.origin =
        authentication.method = NONE
        authentication.realm =
        authentication.roles = [*]
        authentication.skip.paths = []
        ksql.advertised.listener = null
        ksql.authentication.plugin.class = null
        ksql.endpoint.logging.ignored.paths.regex =
        ksql.endpoint.logging.log.queries = false
        ksql.healthcheck.interval.ms = 5000
        ksql.heartbeat.check.interval.ms = 200
        ksql.heartbeat.discover.interval.ms = 2000
        ksql.heartbeat.enable = false
        ksql.heartbeat.missed.threshold.ms = 3
        ksql.heartbeat.send.interval.ms = 100
        ksql.heartbeat.thread.pool.size = 3
        ksql.heartbeat.window.ms = 2000
        ksql.idle.connection.timeout.seconds = 86400
        ksql.internal.http2.max.pool.size = 3000
        ksql.internal.listener = null
        ksql.internal.ssl.client.authentication = NONE
        ksql.lag.reporting.enable = false
        ksql.lag.reporting.send.interval.ms = 5000
        ksql.local.commands.location =
        ksql.logging.server.rate.limited.request.paths =
        ksql.logging.server.rate.limited.response.codes =
        ksql.max.push.queries = 100
        ksql.server.command.blocked.threshold.error.ms = 15000
        ksql.server.command.response.timeout.ms = 5000
        ksql.server.error.messages = class io.confluent.ksql.rest.DefaultErrorMessages
        ksql.server.exception.uncaught.handler.enable = false
        ksql.server.install.dir = /opt/confluent
        ksql.server.preconditions = []
        ksql.server.websockets.num.threads = 5
        ksql.ssl.keystore.alias.external =
        ksql.ssl.keystore.alias.internal =
        ksql.verticle.instances = 2
        ksql.worker.pool.size = 100
        listeners = [http://0.0.0.0:8088]
        query.stream.disconnect.check = 1000
        ssl.cipher.suites = []
        ssl.client.auth = false
        ssl.client.authentication = NONE
        ssl.enabled.protocols = [TLSv1.2, TLSv1.3]
        ssl.key.password = [hidden]
        ssl.keystore.location =
        ssl.keystore.password = [hidden]
        ssl.keystore.reload = false
        ssl.keystore.type = JKS
        ssl.keystore.watch.location =
        ssl.truststore.location =
        ssl.truststore.password = [hidden]
        ssl.truststore.type = JKS
 (io.confluent.ksql.rest.server.KsqlRestConfig:376)
[2022-05-24 11:22:17,482] INFO KsqlConfig values:
        ksql.access.validator.enable = auto
        ksql.authorization.cache.expiry.time.secs = 30
        ksql.authorization.cache.max.entries = 10000
        ksql.cast.strings.preserve.nulls = true
        ksql.connect.basic.auth.credentials.file =
        ksql.connect.basic.auth.credentials.reload = false
        ksql.connect.basic.auth.credentials.source = NONE
        ksql.connect.error.handler = null
        ksql.connect.request.headers.plugin = null
        ksql.connect.url = http://localhost:8083
        ksql.connect.worker.config =
        ksql.create.or.replace.enabled = true
        ksql.error.classifier.regex =
        ksql.extension.dir = ext
        ksql.headers.columns.enabled = true
        ksql.hidden.topics = [_confluent.*, __confluent.*, _schemas, __consumer_offsets, __transaction_state, connect-configs, connect-offsets, connect-status, connect-statuses]
        ksql.insert.into.values.enabled = true
        ksql.internal.topic.min.insync.replicas = 1
        ksql.internal.topic.replicas = 1
        ksql.lambdas.enabled = true
        ksql.metastore.backup.location =
        ksql.metrics.extension = null
        ksql.metrics.tags.custom =
        ksql.nested.error.set.null = true
        ksql.output.topic.name.prefix =
        ksql.persistence.default.format.key = KAFKA
        ksql.persistence.default.format.value = null
        ksql.persistence.wrap.single.values = null
        ksql.persistent.prefix = query_
        ksql.properties.overrides.denylist = []
        ksql.pull.queries.enable = true
        ksql.query.cleanup.shutdown.timeout.ms = 30000
        ksql.query.error.max.queue.size = 10
        ksql.query.persistent.active.limit = 2147483647
        ksql.query.persistent.max.bytes.buffering.total = -1
        ksql.query.pull.consistency.token.enabled = false
        ksql.query.pull.enable.standby.reads = false
        ksql.query.pull.interpreter.enabled = true
        ksql.query.pull.limit.clause.enabled = true
        ksql.query.pull.max.allowed.offset.lag = 9223372036854775807
        ksql.query.pull.max.concurrent.requests = 2147483647
        ksql.query.pull.max.hourly.bandwidth.megabytes = 2147483647
        ksql.query.pull.max.qps = 2147483647
        ksql.query.pull.metrics.enabled = true
        ksql.query.pull.range.scan.enabled = true
        ksql.query.pull.router.thread.pool.size = 50
        ksql.query.pull.stream.enabled = true
        ksql.query.pull.table.scan.enabled = true
        ksql.query.pull.thread.pool.size = 50
        ksql.query.push.v2.alos.enabled = true
        ksql.query.push.v2.catchup.consumer.msg.window = 50
        ksql.query.push.v2.continuation.tokens.enabled = false
        ksql.query.push.v2.enabled = false
        ksql.query.push.v2.interpreter.enabled = true
        ksql.query.push.v2.latest.reset.age.ms = 30000
        ksql.query.push.v2.max.catchup.consumers = 5
        ksql.query.push.v2.max.hourly.bandwidth.megabytes = 2147483647
        ksql.query.push.v2.new.latest.delay.ms = 5000
        ksql.query.push.v2.registry.installed = false
        ksql.query.retry.backoff.initial.ms = 15000
        ksql.query.retry.backoff.max.ms = 900000
        ksql.query.status.running.threshold.seconds = 300
        ksql.query.transient.max.bytes.buffering.total = -1
        ksql.queryanonymizer.cluster_namespace = null
        ksql.queryanonymizer.logs_enabled = true
        ksql.readonly.topics = [_confluent.*, __confluent.*, _schemas, __consumer_offsets, __transaction_state, connect-configs, connect-offsets, connect-status, connect-statuses]
        ksql.rowpartition.rowoffset.enabled = true
        ksql.runtime.feature.shared.enabled = false
        ksql.schema.registry.url = http://localhost:8081
        ksql.security.extension.class = null
        ksql.service.id = default_
        ksql.shared.runtimes.count = 8
        ksql.sink.window.change.log.additional.retention = 1000000
        ksql.source.table.materialization.enabled = true
        ksql.streams.shutdown.timeout.ms = 300000
        ksql.suppress.buffer.size.bytes = -1
        ksql.suppress.enabled = false
        ksql.timestamp.throw.on.invalid = false
        ksql.transient.prefix = transient_
        ksql.udf.collect.metrics = false
        ksql.udf.enable.security.manager = true
        ksql.udfs.enabled = true
        ksql.variable.substitution.enable = true
        metric.reporters = []
        ssl.cipher.suites = null
        ssl.enabled.protocols = [TLSv1.2, TLSv1.3]
        ssl.endpoint.identification.algorithm = https
        ssl.engine.factory.class = null
        ssl.key.password = null
        ssl.keymanager.algorithm = SunX509
        ssl.keystore.certificate.chain = null
        ssl.keystore.key = null
        ssl.keystore.location = null
        ssl.keystore.password = null
        ssl.keystore.type = JKS
        ssl.protocol = TLSv1.3
        ssl.provider = null
        ssl.secure.random.implementation = null
        ssl.trustmanager.algorithm = PKIX
        ssl.truststore.certificates = null
        ssl.truststore.location = null
        ssl.truststore.password = null
        ssl.truststore.type = JKS
 (io.confluent.ksql.util.KsqlConfig:376)
[2022-05-24 11:23:06,156] INFO JsonConverterConfig values:
        converter.type = value
        decimal.format = NUMERIC
        schemas.cache.size = 1000
        schemas.enable = false
 (org.apache.kafka.connect.json.JsonConverterConfig:376)
[2022-05-24 11:23:32,941] INFO AdminClientConfig values:
        bootstrap.servers = [localhost:9092]
        client.dns.lookup = use_all_dns_ips
        client.id =
        connections.max.idle.ms = 300000
        default.api.timeout.ms = 60000
        host.resolver.class = class org.apache.kafka.clients.DefaultHostResolver
        metadata.max.age.ms = 300000
        metric.reporters = []
        metrics.num.samples = 2
        metrics.recording.level = INFO
        metrics.sample.window.ms = 30000
        receive.buffer.bytes = 65536
        reconnect.backoff.max.ms = 1000
        reconnect.backoff.ms = 50
        request.timeout.ms = 30000
        retries = 2147483647
        retry.backoff.ms = 100
        sasl.client.callback.handler.class = null
        sasl.jaas.config = null
        sasl.kerberos.kinit.cmd = /usr/bin/kinit
        sasl.kerberos.min.time.before.relogin = 60000
        sasl.kerberos.service.name = null
        sasl.kerberos.ticket.renew.jitter = 0.05
        sasl.kerberos.ticket.renew.window.factor = 0.8
        sasl.login.callback.handler.class = null
        sasl.login.class = null
        sasl.login.connect.timeout.ms = null
        sasl.login.read.timeout.ms = null
        sasl.login.refresh.buffer.seconds = 300
        sasl.login.refresh.min.period.seconds = 60
        sasl.login.refresh.window.factor = 0.8
        sasl.login.refresh.window.jitter = 0.05
        sasl.login.retry.backoff.max.ms = 10000
        sasl.login.retry.backoff.ms = 100
        sasl.mechanism = GSSAPI
        sasl.oauthbearer.clock.skew.seconds = 30
        sasl.oauthbearer.expected.audience = null
        sasl.oauthbearer.expected.issuer = null
        sasl.oauthbearer.jwks.endpoint.refresh.ms = 3600000
        sasl.oauthbearer.jwks.endpoint.retry.backoff.max.ms = 10000
        sasl.oauthbearer.jwks.endpoint.retry.backoff.ms = 100
        sasl.oauthbearer.jwks.endpoint.url = null
        sasl.oauthbearer.scope.claim.name = scope
        sasl.oauthbearer.sub.claim.name = sub
        sasl.oauthbearer.token.endpoint.url = null
        security.protocol = PLAINTEXT
        security.providers = null
        send.buffer.bytes = 131072
        socket.connection.setup.timeout.max.ms = 30000
        socket.connection.setup.timeout.ms = 10000
        ssl.cipher.suites = null
        ssl.enabled.protocols = [TLSv1.2, TLSv1.3]
        ssl.endpoint.identification.algorithm = https
        ssl.engine.factory.class = null
        ssl.key.password = null
        ssl.keymanager.algorithm = SunX509
        ssl.keystore.certificate.chain = null
        ssl.keystore.key = null
        ssl.keystore.location = null
        ssl.keystore.password = null
        ssl.keystore.type = JKS
        ssl.protocol = TLSv1.3
        ssl.provider = null
        ssl.secure.random.implementation = null
        ssl.trustmanager.algorithm = PKIX
        ssl.truststore.certificates = null
        ssl.truststore.location = null
        ssl.truststore.password = null
        ssl.truststore.type = JKS
 (org.apache.kafka.clients.admin.AdminClientConfig:376)
[2022-05-24 11:23:35,925] WARN The configuration 'metrics.context.resource.version' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig:384)
[2022-05-24 11:23:35,926] WARN The configuration 'metrics.context.resource.commit.id' was supplied but isn't a known config. (org.apache.kafka.clients.admin.AdminClientConfig:384)
[2022-05-24 11:23:36,968] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:37,068] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:37,173] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:37,173] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:37,374] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:37,374] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:37,686] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:37,686] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:38,202] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:38,206] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:39,129] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:39,436] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:40,991] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:40,991] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:42,020] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:42,024] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:43,064] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:43,064] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:43,996] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:43,997] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:45,241] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:45,242] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:46,174] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:46,175] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:47,101] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:47,102] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:48,342] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:48,343] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:49,569] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:49,569] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:50,794] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:50,899] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:51,808] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:51,809] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:52,740] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:52,740] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:53,871] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:53,872] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:54,900] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:54,901] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:55,910] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:55,911] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:57,019] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:57,019] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:58,045] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:58,046] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:23:59,282] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:23:59,282] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:24:00,308] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:24:00,309] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:24:01,431] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:24:01,431] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:24:02,758] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:24:02,758] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:24:03,675] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:24:03,676] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:24:04,894] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:24:04,894] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:24:06,109] INFO [AdminClient clientId=adminclient-1] Node -1 disconnected. (org.apache.kafka.clients.NetworkClient:1047)
[2022-05-24 11:24:06,114] WARN [AdminClient clientId=adminclient-1] Connection to node -1 (localhost/127.0.0.1:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient:870)
[2022-05-24 11:24:06,140] INFO [AdminClient clientId=adminclient-1] Metadata update failed (org.apache.kafka.clients.admin.internals.AdminMetadataManager:235)
org.apache.kafka.common.errors.TimeoutException: Timed out waiting for a node assignment. Call: fetchMetadata
[2022-05-24 11:24:06,143] ERROR Failed to start KSQL (io.confluent.ksql.rest.server.KsqlServerMain:70)
java.lang.RuntimeException: Failed to get Kafka cluster information
        at io.confluent.ksql.services.KafkaClusterUtil.getKafkaClusterId(KafkaClusterUtil.java:107)
        at io.confluent.ksql.rest.server.KsqlRestApplication.buildApplication(KsqlRestApplication.java:645)
        at io.confluent.ksql.rest.server.KsqlServerMain.createExecutable(KsqlServerMain.java:162)
        at io.confluent.ksql.rest.server.KsqlServerMain.main(KsqlServerMain.java:63)
Caused by: java.util.concurrent.TimeoutException
        at java.base/java.util.concurrent.CompletableFuture.timedGet(CompletableFuture.java:1886)
        at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2021)
        at org.apache.kafka.common.internals.KafkaFutureImpl.get(KafkaFutureImpl.java:180)
        at io.confluent.ksql.services.KafkaClusterUtil.getKafkaClusterId(KafkaClusterUtil.java:105)
        ... 3 more
kafta@kafta-VirtualBox:~$

Re: issue starting my ksql-server

Richard MacCutchan25-May-22 22:03

Hash Table implementation

25-May-22 22:03

This has nothing to do with Java programming. The error messages are clearly identifying issues with the third party product. You should go to the KafkaSQL website for help.

Member 156289598-May-22 18:52

Member 15628959

8-May-22 18:52

Hash tables provide a mechanism by which you can create indexed tables in which the index is a value other than a string. Implement and test an integer key Open Address Hash table. Implement the following interface. • String get(int k); • void put(int k, String v); • bool contains(int k); • void delete(int k); • void printHash(); You must provide an interactive or command-line test application for the hash table. Make the hash table 31 entries, and make sure at least one collision occurs in your data input. You must delete some data from your table to demonstrate deletion. (100 points)

Notable to get output. Could you please anyone help me on this

Re: Hash Table implementation

Richard Deeming8-May-22 21:27

Richard Deeming

8-May-22 21:27

Nobody is going to do your homework for you. If you don't know where to start, talk to your teacher.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: Hash Table implementation

Richard MacCutchan8-May-22 21:43