Understanding method signature in NoSuchMethod exception

java exception constructor init nosuchmethoderror
popcoder picture popcoder · Dec 1, 2011 · Viewed 11k times · Source

I got this exception but resolved it.

java.lang.NoSuchMethodError: antlr.NoViableAltForCharException.<init>
(CLjava/lang/String;II)V

But i'd like to know how to interpret these kind of messages: "(CLjava/lang/String;II)V" Also, does this "init" mention the constructor of NoViableAltForCharException class??

Thanks.

Answer

gkamal picture gkamal · Dec 1, 2011

Type Signatures - taken from this page.

The JNI uses the Java VM’s representation of type signatures. Table 3-2 shows these type signatures.

Z                               boolean
B                               byte
C                               char
S                               short
I                               int
J                               long
F                               float
D                               double
L fully-qualified-class ;       fully-qualified-class
[ type                          type[]
( arg-types ) ret-type          method type

For example, the Java method:

long f (int n, String s, int[] arr);

has the following type signature:

(ILjava/lang/String;[I)J

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