Setting the target version of Java in ant javac

Question

I need to compile a jar file using ant  1 7 0  to run under a specific version of Java  1 5   I currently have Java 1 6 on my machine  I have tried setting    lt target name  compile  gt     lt javac compiler  javac1 5  target  1 5  srcdir      gt   lt  target gt    I have also removed    lt property name  build compiler  value  modern   gt    and there is no properties file  I am running Java 1 6 on Linux SUSE  Also is there a simple way of determining which version of Java is expected in the jar file

User · Answer

To find the version of the java in the classfiles I used:

javap -verbose <classname>

which announces the version at the start as

minor version: 0
major version: 49

which corresponds to Java 1.5

User · Answer

Use  target  attribute and remove the  compiler  attribute  See here  So it should go something like this    lt target name  compile  gt     lt javac target  1 5  srcdir      gt   lt  target gt    Hope this helps

User · Answer

You may also set   ant build javac target 1 5   ant property to update default target version of  task   See http   ant apache org manual javacprops html target

User · Answer

Both source and target should be specified  I recommend providing ant defaults  that way you do not need to specify source target attribute for every javac task    lt property name  ant build javac source  value  1 5   gt   lt property name  ant build javac target  value  1 5   gt    See Java cross-compiling notes for more information

[ant] Setting the target version of Java in ant javac

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