Jira issue on Tapestry 4.1 not being java 1.4 compatible

I haven't been able to find an answer my question from yesterday - whether or not Tapestry 4.1 should be java 1.4 compatible.

After writing in the tapestry mailing list I was urged to create a Jira issue.
So I did and the issue can be found in JIRA: TAPESTRY-1520.
I have also created a small sample testcase demonstrating the problem.

For those interested the sample application can be found here and a log showing what I did can be seen here:

jeyben@vilfortpark /cygdrive/c/projects/sandbox/tapestry-jira
$ echo $JAVA_HOME
C:\jdk\j2sdk1.4.2_10

jeyben@vilfortpark /cygdrive/c/projects/sandbox/tapestry-jira
$ mvn
[INFO] Scanning for projects...
[INFO] ----------------------------------------------------------------------------
[INFO] Building Prove JDK issue
[INFO] task-segment: [install]
[INFO] ----------------------------------------------------------------------------
[INFO] [resources:resources]
[INFO] Using default encoding to copy filtered resources.
[INFO] [compiler:compile]
[INFO] No sources to compile
[INFO] [resources:testResources]
[INFO] Using default encoding to copy filtered resources.
[INFO] [compiler:testCompile]
[INFO] Compiling 1 source file to c:\projects\sandbox\tapestry-jira\target\test-classes
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Compilation failure
c:\projects\sandbox\tapestry-jira\src\test\java\org\apache\tapestry\components\TestJdkIssue.java:[4,-1] cannot access org.apache.tapestry.engine.RequestCycle
bad class file: C:\Documents and Settings\jeyben\.m2\repository\org\apache\tapestry\tapestry-framework\4.1\tapestry-framework-4.1.jar(org/apache/tapestry/engine/RequestCycle.class)
class file has wrong version 49.0, should be 48.0



c:\projects\sandbox\tapestry-jira\src\test\java\org\apache\tapestry\components\TestJdkIssue.java:[4,-1] cannot access org.apache.tapestry.engine.RequestCycle
bad class file: C:\Documents and Settings\jeyben\.m2\repository\org\apache\tapestry\tapestry-framework\4.1\tapestry-framework-4.1.jar(org/apache/tapestry/engine/RequestCycle.class)
class file has wrong version 49.0, should be 48.0


[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2 seconds
[INFO] Finished at: Sat May 26 17:49:22 CEST 2007
[INFO] Final Memory: 6M/14M
[INFO] ------------------------------------------------------------------------

jeyben@vilfortpark /cygdrive/c/projects/sandbox/tapestry-jira
$ export JAVA_HOME=C:\\jdk\\jdk1.5.0_06

jeyben@vilfortpark /cygdrive/c/projects/sandbox/tapestry-jira
$ mvn
[INFO] Scanning for projects...
[INFO] ----------------------------------------------------------------------------
[INFO] Building Prove JDK issue
[INFO] task-segment: [install]
[INFO] ----------------------------------------------------------------------------
[INFO] [resources:resources]
[INFO] Using default encoding to copy filtered resources.
[INFO] [compiler:compile]
[INFO] No sources to compile
[INFO] [resources:testResources]
[INFO] Using default encoding to copy filtered resources.
[INFO] [compiler:testCompile]
[INFO] Compiling 1 source file to c:\projects\sandbox\tapestry-jira\target\test-classes
[INFO] [surefire:test]
[INFO] Surefire report directory: c:\projects\sandbox\tapestry-jira\target\surefire-reports

-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running org.apache.tapestry.components.TestJdkIssue
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.063 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

[INFO] [jar:jar]
[WARNING] JAR will be empty - no content was marked for inclusion!
[INFO] Building jar: c:\projects\sandbox\tapestry-jira\target\tapestry-jdk-issue-1.0.0-SNAPSHOT.jar
[INFO] [install:install]
[INFO] Installing c:\projects\sandbox\tapestry-jira\target\tapestry-jdk-issue-1.0.0-SNAPSHOT.jar to C:\Documents and Settings\jeyben\.m2\repository\com\nordija\tapestry\issue\tapestry-jdk-issue\1.0.0-SNAPSHOT\tapestry-jdk-issue-1.0.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESSFUL
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3 seconds
[INFO] Finished at: Sat May 26 17:50:05 CEST 2007
[INFO] Final Memory: 8M/14M
[INFO] ------------------------------------------------------------------------