Transform application compiled in jdk1.4 to jdk1.7

Question

I'm working on an application that has been created long time ago (maybe 2008/2009). Now I got the task of upgrading the server. Previously it was compiled in jdk1.4. Now I have to make the application compatible with jdk1.7. I tried to compile it with jre7 and I've changed source and target value of ant build.xml file to 1.7. And also in ANT build the jre7 is selected as compiler environment. I'm getting the following error message:

 [javac] javac: invalid target release: 1.7
    [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]   -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]   -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]   -help                     Print a synopsis of standard options

I tried to print the java version using following line:

and it shows :

[echo] Using Java version 1.7.

What (other) changes do I need to make to make it work with jdk1.7?

Check in your ant xml and see if there is any 'target' parameter set to 1.4 — Ratshiḓaho Wayne, Sep 29 '14 at 12:06
possible duplicate of [invalid target release: 1.7](http://stackoverflow.com/questions/19891423/invalid-target-release-1-7) — Seelenvirtuose, Sep 29 '14 at 12:07
Java 1.4 was 2002, Java 5 came out in 2004 and Java 6 came out in 2006. — Elliott Frisch, Sep 29 '14 at 12:40
@RatshiḓahoWayne in my build.xml target parameter is as follows: — Nadim Aseq A Arman, Sep 29 '14 at 12:40
@ElliottFrisch Ya may be you're right about the released year. But I was telling about the application I'm working. However this apps was created in 2008 but it was using jdk1.4 in a OAS application server. — Nadim Aseq A Arman, Sep 29 '14 at 12:45
@Seelenvirtuose Thanks for the information. May be it's releated to the thread you indicated but I didn't found solution there. because in my case I'v setted the JAVA_HOME to the jdk1.7 same as in the eclipse project properties. — Nadim Aseq A Arman, Sep 29 '14 at 12:47

score 0 · Accepted Answer · answered Sep 29 '14 at 13:05

0

Problem Solved. I was trying to compile with JRE7 instead of jdk1.7. with jdk1.7 installed and target and source changed in ant build.xml file solved my problem.

answered Sep 29 '14 at 13:05

Nadim Aseq A Arman

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Transform application compiled in jdk1.4 to jdk1.7

1 Answers1