IDE hangs. bluej-debuglog.txt follows ---- BlueJ run started: Wed Feb 12 12:39:31 GMT 2020 BlueJ version 4.2.1 Java version 11.0.2 JavaFX version 11.0.2+1 Virtual machine: OpenJDK 64-Bit Server VM 11.0.2+9 (Oracle Corporation) Running on: Windows 10 10.0 (amd64) Java Home: C:\Program Files\BlueJ\jdk ---- Opening project: C:\Users\jm39389\OneDrive\BlueJay\projects\chapter04\music-organizer-v1 1581511176730: Listening for JDWP connection on address: javadebug Connected to debug VM via dt_shmem transport... Communication with debug VM fully established. compiler message file broken: key=compiler.misc.msg.bug arguments=11.0.2, \{1}, \{2}, \{3}, \{4}, \{5}, \{6}, \{7} java.lang.UnsupportedOperationException at jdk.zipfs/jdk.nio.zipfs.ZipFileSystemProvider.ensureFile(ZipFileSystemProvider.java:82) at jdk.zipfs/jdk.nio.zipfs.ZipFileSystemProvider.newFileSystem(ZipFileSystemProvider.java:130) at jdk.compiler/com.sun.tools.javac.file.JavacFileManager$ArchiveContainer.<init>(JavacFileManager.java:514) at jdk.compiler/com.sun.tools.javac.file.JavacFileManager.getContainer(JavacFileManager.java:316) at jdk.compiler/com.sun.tools.javac.file.JavacFileManager.list(JavacFileManager.java:712) at jdk.compiler/com.sun.tools.javac.code.ClassFinder.list(ClassFinder.java:734) at jdk.compiler/com.sun.tools.javac.code.ClassFinder.scanUserPaths(ClassFinder.java:678) at jdk.compiler/com.sun.tools.javac.code.ClassFinder.fillIn(ClassFinder.java:551) at jdk.compiler/com.sun.tools.javac.code.ClassFinder.complete(ClassFinder.java:299) at jdk.compiler/com.sun.tools.javac.code.Symtab.lambda$addRootPackageFor$8(Symtab.java:780) at jdk.compiler/com.sun.tools.javac.code.Symbol.complete(Symbol.java:642) at jdk.compiler/com.sun.tools.javac.comp.Enter.visitTopLevel(Enter.java:355) at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:529) at jdk.compiler/com.sun.tools.javac.comp.Enter.classEnter(Enter.java:286) at jdk.compiler/com.sun.tools.javac.comp.Enter.classEnter(Enter.java:301) at jdk.compiler/com.sun.tools.javac.comp.Enter.complete(Enter.java:576) at jdk.compiler/com.sun.tools.javac.comp.Enter.main(Enter.java:560) at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:1066) at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:937) at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:104) at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.handleExceptions(JavacTaskImpl.java:147) at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:100) at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:94) at bluej.compiler.CompilerAPICompiler.compile(CompilerAPICompiler.java:230) at bluej.compiler.Job.compile(Job.java:107) at bluej.compiler.CompilerThread.run(CompilerThread.java:72) java.lang.NullPointerException at jdk.compiler/com.sun.tools.javac.comp.TypeEnter.ensureImportsChecked(TypeEnter.java:166) at jdk.compiler/com.sun.tools.javac.comp.Enter.complete(Enter.java:600) at jdk.compiler/com.sun.tools.javac.comp.Enter.main(Enter.java:560) at jdk.javadoc/jdk.javadoc.internal.tool.JavadocEnter.main(JavadocEnter.java:79) at jdk.javadoc/jdk.javadoc.internal.tool.JavadocTool.getEnvironment(JavadocTool.java:206) at jdk.javadoc/jdk.javadoc.internal.tool.Start.parseAndExecute(Start.java:570) at jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:431) at jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:344) at jdk.javadoc/jdk.javadoc.internal.tool.Main.execute(Main.java:75) at jdk.javadoc/jdk.javadoc.internal.api.JavadocTool.run(JavadocTool.java:156) at bluej.pkgmgr.DocuGenerator$DocuRunStarter.run(DocuGenerator.java:190) java.lang.NullPointerException at jdk.compiler/com.sun.tools.javac.comp.TypeEnter.ensureImportsChecked(TypeEnter.java:166) at jdk.compiler/com.sun.tools.javac.comp.Enter.complete(Enter.java:600) at jdk.compiler/com.sun.tools.javac.comp.Enter.main(Enter.java:560) at jdk.javadoc/jdk.javadoc.internal.tool.JavadocEnter.main(JavadocEnter.java:79) at jdk.javadoc/jdk.javadoc.internal.tool.JavadocTool.getEnvironment(JavadocTool.java:206) at jdk.javadoc/jdk.javadoc.internal.tool.Start.parseAndExecute(Start.java:570) at jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:431) at jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:344) at jdk.javadoc/jdk.javadoc.internal.tool.Main.execute(Main.java:75) at jdk.javadoc/jdk.javadoc.internal.api.JavadocTool.run(JavadocTool.java:156) at bluej.pkgmgr.DocuGenerator$DocuRunStarter.run(DocuGenerator.java:190) --- **Issue metadata** - Issue type: Task - Priority: Medium