NoClassDefFoundError error while invoking method added using Java ASM

Question

I'm using ASM to inject code to methods:

    @Override
    public void visitCode() {
        visitMethodInsn(Opcodes.INVOKESTATIC, "sssss/CopyOfsss", "foo", "()V");

        super.visitCode();
    }


Exception in thread "main" java.lang.NoClassDefFoundError: sssss/CopyOfsss
    at java.util.regex.Pattern$Node.match(Pattern.java)
    at java.util.regex.Pattern$CharProperty.match(Pattern.java:3345)
    at java.util.regex.Pattern$Curly.match0(Pattern.java:3760)
    at java.util.regex.Pattern$Curly.match(Pattern.java:3744)
    at java.util.regex.Matcher.match(Matcher.java:1127)
    at java.util.regex.Matcher.matches(Matcher.java:502)
    at sssss.CopyOfsss.main(CopyOfsss.java:26)

please help~

This doesn't help man! Would you please figure out where and which chapter to read? If I changed the class to "java.land.System" and call the nanoTime, it works. — Sefler
– Sefler, Commented Oct 18, 2012 at 8:37
The NoClassDefFoundError (roughly) means the class was there on compile time, but not on runtime - do you perhaps have a classpath issue or a bungled JAR file here? — Anders R. Bystrup
– Anders R. Bystrup, Commented Oct 18, 2012 at 9:08
As you see above the "sssss/CopyOfsss" is the main class. It must be exist~ — Sefler
– Sefler, Commented Oct 18, 2012 at 9:20
Which suggests it may be a classloader issue? If CopyOfssss is loaded by a child classloader, makes a call in to a class loaded by its parent loader, and that class then tries to make a static call back to CopyOfsssss then it will fail (the child CL can see classes loaded by the parent but not vice-versa). — Ian Roberts
– Ian Roberts, Commented Oct 18, 2012 at 10:36

Laurel · Accepted Answer · 2016-05-01 20:00:26Z

1

Well, I got my answer. This is because the injected class is loaded by bootstrap class loader, so the injected code can't call methods in "CopyOfsssss". Refer to this article. The solution is adding "-Xbootclasspath/a:/path/yourclass.lib" to the jvm argument. Note the "/a" after "Xbootclasspath" means appending.

edited May 1, 2016 at 20:00

Laurel

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answered Oct 29, 2012 at 7:03

Sefler

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