I am pasting a full display with java -version output : just to make sure we are in the same page: C:\JBOSSSIM\jboss-seam-1.2.1.GA>java -version java version "1.6.0_01" Java(TM) SE Runtime Environment (build 1.6.0_01-b06) Java HotSpot(TM) Client VM (build 1.6.0_01-b06, mixed mode, sharing) C:\JBOSSSIM\jboss-seam-1.2.1.GA>ant Buildfile: build.xml init: [echo] Build JBoss Seam 1.2 select-compiler: antlr: compilecore: [javac] Compiling 382 source files to C:\JBOSSSIM\jboss-seam-1.2.1.GA\build\ classes [javac] javac: invalid target release: 1.5 [javac] Usage: javac <source files> [javac] where possible options include: [javac] -g Generate all debugging info [javac] -g:none Generate no debugging info [javac] -g:{lines,vars,source} Generate only some debugging info [javac] -nowarn Generate no warnings [javac] -verbose Output messages about what the compiler is doing [javac] -deprecation Output source locations where deprecated APIs are used [javac] -classpath Specify where to find user class files [javac] -sourcepath Specify where to find input source files [javac] -bootclasspath Override location of bootstrap class fil es [javac] -extdirs Override location of installed extension s [javac] -d Specify where to place generated class f iles [javac] -encoding Specify character encoding used by sourc e files [javac] -source Provide source compatibility with specif ied release [javac] -target Generate class files for specific VM ver sion [javac] -help Print a synopsis of standard options BUILD FAILED C:\JBOSSSIM\jboss-seam-1.2.1.GA\build.xml:670: Compile failed; see the compiler error output for details. Total time: 2 seconds C:\JBOSSSIM\jboss-seam-1.2.1.GA> Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4041681#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...