problem in ant build invalid target release

Question

problem in ant build

[javac] Compiling 86 source files to F:\\XXX\\classes
    [javac] javac: invalid target release: 1.6
    [javac] Usage: javac 

        

Answer 1

Yes, this is an old one, but came across at work and could not find a solution documented anywhere yet...

Even though I too came across this using Ant, it in fact does not seem to have anything to do with Ant - there seem to have been some broken JDK builds out there:

C:\>%JAVA_HOME%\bin\javac -version
javac 1.6.0_21
javac: no source files
Usage: javac  
...

C:\>%JAVA_HOME%\bin\javac -target 1.6
javac: invalid target release: 1.6
Usage: javac  
...

Where as another 1.6 build looks like:

C:\>set JAVA_HOME=C:\Progra~1\Java\jdk1.6.0_45

C:\>%JAVA_HOME%\bin\javac -version
javac 1.6.0_45

C:\>%JAVA_HOME%\bin\javac -target 1.6
javac: no source files
Usage: javac  
use -help for a list of possible options

So the solution is to upgrade JDK.