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Editorial Team
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Asked: 2026-05-23T17:15:48+00:00

I am getting a java.lang.VerifyError, on the page of oracle it says it’s thrown

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I am getting a java.lang.VerifyError, on the page of oracle it says it’s thrown because of inconsistencies or security problems. But this can be an awful lot of things and I don’t even know what I’m looking for or in which class I should look.

The error message doesn’t clarify things either:

java.lang.VerifyError: (class: proto/lua/libraries/ProtoLib$Lib1, method: call signature: ()Lproto/lua/LuaValue;) Wrong return type in function

What inconsistencies should I be on the lookout for? And can anyone tell in what class I should look based on that error?

Any general help/info on the topic of these exceptions would be appreciated too

EDIT: I rewrote much of the Lua Library and until I got this error that worked perfectly fine in every aspect and I use Java SE 6 Update 26

EDIT: Whole error:

java.lang.VerifyError: (class: proto/lua/libraries/ProtoLib$Lib1, method: call signature: ()Lproto/lua/LuaValue;) Wrong return type in function
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
    at java.lang.Class.getConstructor0(Class.java:2699)
    at java.lang.Class.newInstance0(Class.java:326)
    at java.lang.Class.newInstance(Class.java:308)
    at proto.lua.libraries.LibFunction.bind(LibFunction.java:169)
    at proto.lua.libraries.LibFunction.bind(LibFunction.java:152)
    at proto.lua.libraries.ProtoLib.call(ProtoLib.java:26)
    at proto.lua.otherstuff.OneArgFunction.call(OneArgFunction.java:66)
    at proto.lua.LuaValue.load(LuaValue.java:1358)
    at proto.lua.RavenLua.standardGlobals(RavenLua.java:100)
    at proto.ProjectPROTO.<clinit>(ProjectPROTO.java:51)
Could not find the main class: proto.ProjectPROTO.  Program will exit.
Exception in thread "main" Java Result: 1

All proto.xxx.xxx.xxx classes are part of the source

EDIT: Well apparently the error was caused since I forgot some @Override annotations, don’t know what made them start giving errors though.

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1 Answer

  1. Editorial Team

    What is the full stack trace? It should show that which class is calling that method. Probably the reason is that the code is being executed against a different version of the library that it was compiled against, and there is some incompatible change between those library versions (from the error message it appears to be a different method return type).

    If that error is not about any library, but about your own code, then do a clean build. The compiler should produce a compile error about all things which may cause a verify error at runtime. Or if the source code is correct, it should rebuild all the class files correctly.

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