OCLE java application - exception in thread "main" java.lang.exceptionininitializererror [duplicate]

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Java

I'm trying to run a Java app on Linux using the ZSH shell environment. The app is OCLE version 2.0.4

The app uses a shell script with the following code for starting the app:

#!/bin/sh
# The Java interpreter must be in PATH
# Set OCLE_HOME to the directory where the distribution was unpacked

OCLE_HOME=/home/user/ocle-2.0.4

if [ "$OCLE_HOME" == "" ]; then 
    echo "Please set the OCLE_HOME environment variable to the directory where the distribution was unpacked. "
    exit 1
fi

OCLE_LIB=${OCLE_HOME}/lib

java -Xms192m -Xmx192m -Djava.library.path=${OCLE_LIB} -classpath ${OCLE_LIB}/jgraph.jar:${OCLE_LIB}/kLF.jar:${OCLE_LIB}/template.jar:${OCLE_LIB}/velocity-dep-1.3.jar:${OCLE_LIB}/Whiteboard.jar:${OCLE_HOME}/bin ro.ubbcluj.lci.gui.mainframe.GApplication

Error output:

Exception in thread "main" java.lang.ExceptionInInitializerError
at ro.ubbcluj.lci.ocl.batcheval.CustomizationDialog.updateTree(CustomizationDialog.java:189)
at ro.ubbcluj.lci.ocl.batcheval.CustomizationDialog.initialize(CustomizationDialog.java:120)
at ro.ubbcluj.lci.ocl.batcheval.CustomizationDialog.<init>(CustomizationDialog.java:26)
at ro.ubbcluj.lci.ocl.batcheval.BatchEvaluationSystem.<init>(BatchEvaluationSystem.java:105)
at ro.ubbcluj.lci.gui.mainframe.GApplication.main(GApplication.java:218)
Caused by: java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null
at java.desktop/javax.swing.ImageIcon.<init>(ImageIcon.java:232)
at ro.ubbcluj.lci.gui.tools.tree.SelectionTreeCellRenderer.<clinit>(SelectionTreeCellRenderer.java:39)
... 5 more

Thank you.

What I have tried:

I tried running the app using Oracle JDK 18 and OpenJDK 18 with the same result.