Crash while loading Jar

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java.lang.StringIndexOutOfBoundsException: String index out of range: 0
	at java.base/java.lang.StringLatin1.charAt(StringLatin1.java:48)
	at java.base/java.lang.String.charAt(String.java:1512)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:200)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassDefEntry.<init>(ClassDefEntry.java:35)
	at cuchaz.enigma.translation.representation.entry.ClassDefEntry.parse(ClassDefEntry.java:57)
	at cuchaz.enigma.analysis.index.IndexClassVisitor.visit(IndexClassVisitor.java:21)
	at org.objectweb.asm.tree.ClassNode.accept(ClassNode.java:371)
	at cuchaz.enigma.analysis.index.JarIndex.indexJar(JarIndex.java:68)
	at cuchaz.enigma.Enigma.openJar(Enigma.java:65)
	at cuchaz.enigma.gui.GuiController.lambda$openJar$1(GuiController.java:105)
	at cuchaz.enigma.gui.dialog.ProgressDialog.lambda$runOffThread$1(ProgressDialog.java:97)
	at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:718)
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165)

File: https://anonfiles.com/dcn9V7c9yf/Android_8.8.88.7830_jar Converted by dex2jar from QQ

Enigma 2.1.0

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I tryed to set a breakpoint using Arthas and I got such a report:

[arthas@11392]$ watch cuchaz.enigma.translation.representation.entry.ClassEntry getOuterClass params -e
Press Q or Ctrl+C to abort.
Affect(class count: 2 , method count: 2) cost in 140 ms, listenerId: 4
method=cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass location=AtExceptionExit
ts=2022-05-04 15:33:41; [cost=0.0787ms] result=@Object[][
    @String[],
]
method=cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass location=AtExceptionExit
ts=2022-05-04 15:33:41; [cost=2.1547ms] result=@Object[][
    @String[$r8],
]
method=cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass location=AtExceptionExit
ts=2022-05-04 15:33:41; [cost=2.7951ms] result=@Object[][
    @String[$r8$backportedMethods],
]
method=cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass location=AtExceptionExit
ts=2022-05-04 15:33:41; [cost=4.9083ms] result=@Object[][
    @String[$r8$backportedMethods$utility],
]
method=cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass location=AtExceptionExit
ts=2022-05-04 15:33:41; [cost=6.0708ms] result=@Object[][
    @String[$r8$backportedMethods$utility$Long],
]
method=cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass location=AtExceptionExit
ts=2022-05-04 15:33:41; [cost=6.7612ms] result=@Object[][
    @String[$r8$backportedMethods$utility$Long$1],
]
method=cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass location=AtExceptionExit
ts=2022-05-04 15:33:41; [cost=7.1624ms] result=@Object[][
    @String[$r8$backportedMethods$utility$Long$1$hashCode],
]

In the JAR, I found that there are only these classes:

But there is no parent class for $r8, so this makes Enigma crash.

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I think classes starts with $ should be proceeded as parent class directly.

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By the way, cuchaz.enigma.analysis.index.IndexReferenceVisitor.lambda$visitMethod$0 crashed, too.

java.lang.RuntimeException: org.objectweb.asm.tree.analysis.AnalyzerException: Error at instruction 17: String index out of range: 0
	at cuchaz.enigma.analysis.index.IndexReferenceVisitor.lambda$visitMethod$0(IndexReferenceVisitor.java:48)
	at cuchaz.enigma.analysis.MethodNodeWithAction.visitEnd(MethodNodeWithAction.java:17)
	at org.objectweb.asm.tree.MethodNode.accept(MethodNode.java:770)
	at org.objectweb.asm.tree.MethodNode.accept(MethodNode.java:647)
	at org.objectweb.asm.tree.ClassNode.accept(ClassNode.java:451)
	at cuchaz.enigma.analysis.index.JarIndex.indexJar(JarIndex.java:74)
	at cuchaz.enigma.Enigma.openJar(Enigma.java:65)
	at cuchaz.enigma.gui.GuiController.lambda$openJar$1(GuiController.java:105)
	at cuchaz.enigma.gui.dialog.ProgressDialog.lambda$runOffThread$1(ProgressDialog.java:97)
	at java.base/java.util.concurrent.CompletableFuture$UniAccept.tryFire(CompletableFuture.java:718)
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:483)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:373)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1182)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1655)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1622)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:165)
Caused by: org.objectweb.asm.tree.analysis.AnalyzerException: Error at instruction 17: String index out of range: 0
	at org.objectweb.asm.tree.analysis.Analyzer.analyze(Analyzer.java:296)
	at cuchaz.enigma.analysis.index.IndexReferenceVisitor.lambda$visitMethod$0(IndexReferenceVisitor.java:46)
	... 15 more
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 0
	at java.base/java.lang.StringLatin1.charAt(StringLatin1.java:48)
	at java.base/java.lang.String.charAt(String.java:1512)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:200)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.getOuterClass(ClassEntry.java:206)
	at cuchaz.enigma.translation.representation.entry.ClassEntry.<init>(ClassEntry.java:32)
	at cuchaz.enigma.translation.representation.entry.MethodEntry.parse(MethodEntry.java:44)
	at cuchaz.enigma.analysis.index.IndexReferenceVisitor$MethodInterpreter.naryOperation(IndexReferenceVisitor.java:109)
	at cuchaz.enigma.analysis.index.IndexReferenceVisitor$MethodInterpreter.naryOperation(IndexReferenceVisitor.java:53)
	at org.objectweb.asm.tree.analysis.Frame.executeInvokeInsn(Frame.java:684)
	at org.objectweb.asm.tree.analysis.Frame.execute(Frame.java:609)
	at org.objectweb.asm.tree.analysis.Analyzer.analyze(Analyzer.java:188)
	... 16 more

[arthas@11392]$ watch cuchaz.enigma.analysis.index.IndexReferenceVisitor lambda$visitMethod$0 params -e
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 192 ms, listenerId: 5
method=cuchaz.enigma.analysis.index.IndexReferenceVisitor.lambda$visitMethod$0 location=AtExceptionExit
ts=2022-05-04 15:42:24; [cost=0.1755ms] result=@Object[][
    @MethodDefEntry[com/tencent/videocut/utils/lyric/Sentence.hashCode()I],
    @MethodNodeWithAction[cuchaz.enigma.analysis.MethodNodeWithAction@4fb9eb2b],
]

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A quick arthas command to find out which class caused crashed: watch org.objectweb.asm.tree.ClassNode accept target.name -e