Build fails with "java.lang.NoClassDefFoundError"

[H3xept]

Hi, I'm trying to build FlightPlot from source but I'm getting a "NoClassDefFoundError".
I'm on macOS Big Sur (11.4).
I also needed to update the build.xml file; source and target versions (1.6) are now deprecated. I instead used "1.8".

Here's the complete error log:

`
BUILD FAILED
/Users/h3xept/Desktop/FlightPlot/build.xml:24: java.lang.NoClassDefFoundError: sun/misc/Resource
at com.intellij.compiler.instrumentation.InstrumentationClassFinder$ClassFinderClasspath.getLoader(InstrumentationClassFinder.java:499)
at com.intellij.compiler.instrumentation.InstrumentationClassFinder$ClassFinderClasspath.getLoader(InstrumentationClassFinder.java:470)
at com.intellij.compiler.instrumentation.InstrumentationClassFinder$ClassFinderClasspath.getResource(InstrumentationClassFinder.java:436)
at com.intellij.compiler.instrumentation.InstrumentationClassFinder.getClassBytesAsStream(InstrumentationClassFinder.java:148)
at com.intellij.compiler.instrumentation.InstrumentationClassFinder.loadClass(InstrumentationClassFinder.java:104)
at com.intellij.uiDesigner.compiler.StringPropertyCodeGenerator.generateClassStart(StringPropertyCodeGenerator.java:56)
at com.intellij.uiDesigner.compiler.AsmCodeGenerator$FormClassVisitor.visit(AsmCodeGenerator.java:254)
at org.jetbrains.asm4.ClassReader.accept(Unknown Source)
at org.jetbrains.asm4.ClassReader.accept(Unknown Source)
at com.intellij.uiDesigner.compiler.AsmCodeGenerator.patchClass(AsmCodeGenerator.java:184)
at com.intellij.uiDesigner.compiler.AsmCodeGenerator.patchClass(AsmCodeGenerator.java:154)
at com.intellij.uiDesigner.compiler.AsmCodeGenerator.patchFile(AsmCodeGenerator.java:126)
at com.intellij.ant.Javac2.instrumentForms(Javac2.java:298)
at com.intellij.ant.Javac2.compile(Javac2.java:215)
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:1117)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)
at org.apache.tools.ant.Task.perform(Task.java:350)
at org.apache.tools.ant.Target.execute(Target.java:449)
at org.apache.tools.ant.Target.performTasks(Target.java:470)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1401)
at org.apache.tools.ant.Project.executeTarget(Project.java:1374)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1264)
at org.apache.tools.ant.Main.runBuild(Main.java:827)
at org.apache.tools.ant.Main.startAnt(Main.java:223)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:284)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:101)
Caused by: java.lang.ClassNotFoundException: sun.misc.Resource
at org.apache.tools.ant.AntClassLoader.findClassInComponents(AntClassLoader.java:1383)
at org.apache.tools.ant.AntClassLoader.findClass(AntClassLoader.java:1338)
at org.apache.tools.ant.AntClassLoader.loadClass(AntClassLoader.java:1093)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
... 32 more

Total time: 0 seconds
`

I'm not familiar with the ant build tool -- how can I fix the problem and build the program?
Thanks!

[Victozzz]

Hi,

Did you find a solution to finally build the program ?
I'm facing the same issue... Can anyone help please ?

Thanks

[minthukyaw99]

I am not expert in java but I did the following.
brew install --cask adoptopenjdk
brew install --cask adoptopenjdk8
switch version to 8
export JAVA_HOME=/usr/libexec/java_home -v 1.8

[afwilkin]

This helped.

for linux
sudo apt-get autoremove default-jdk openjdk-11-*
sudo apt install openjdk-8-jdk

worked like a charm