Possible Duplicate:
problem in ant build invalid target release




使用ant构建我的项目时遇到以下问题：

[echo] Using Java version 1.6.
build-java-lib:
make-jar:
clean:
   [delete] Deleting directory C:\xxx\bin
compile-src:
    [mkdir] Created dir: C:\xxx\bin
    [javac] Compiling 102 source files to C:\Users\xxx\Work\AndroidProjects\xxxx\bin
    [javac] javac: invalid target release: 1.6
    [javac] Usage: javac <options> <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 <path>          Specify where to find user class files
    [javac]   -cp <path>                 Specify where to find user class files
    [javac]   -sourcepath <path>         Specify where to find input source files
    [javac]   -bootclasspath <path>      Override location of bootstrap class files
    [javac]   -extdirs <dirs>            Override location of installed extensions
    [javac]   -endorseddirs <dirs>       Override location of endorsed standards path
    [javac]   -d <directory>             Specify where to place generated class files
    [javac]   -encoding <encoding>       Specify character encoding used by source files
    [javac]   -source <release>          Provide source compatibility with specified release
    [javac]   -target <release>          Generate class files for specific VM version
    [javac]   -version                   Version information
    [javac]   -help                      Print a synopsis of standard options
    [javac]   -X                         Print a synopsis of nonstandard options
    [javac]   -J<flag>                   Pass <flag> directly to the runtime system

BUILD FAILED

看起来像problem in ant build invalid target release的重复。确保javac本身（而不仅仅是Ant）正在使用Java 1.6。