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https://issues.apache.org/jira/browse/DERBY-5542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170843#comment-13170843
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Knut Anders Hatlen commented on DERBY-5542:
-------------------------------------------
Since we compile every class in Derby with target level 1.4 or higher, none of
the classes will even load on a pre-jdk14 jvm. This is what I see with Java 1.3
and Derby 10.8.2.2:
java.lang.UnsupportedClassVersionError: org/apache/derby/tools/sysinfo
(Unsupported major.minor version 48.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:488)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:106)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:243)
at java.net.URLClassLoader.access$100(URLClassLoader.java:51)
at java.net.URLClassLoader$1.run(URLClassLoader.java:190)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:183)
at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:310)
Even though most of the engine classes must still be compiled with target level
1.4 for CDC/FP support, we'll probably want to change the target level to 1.5
for the JDBC 3.0 specific classes (like EmbeddedDriver and EmbeddedDataSource),
so that a similar error will be seen when trying to load Derby 10.9 on Java 1.4.
> Remove checks for Java version being greater than or equal to 1.4
> -----------------------------------------------------------------
>
> Key: DERBY-5542
> URL: https://issues.apache.org/jira/browse/DERBY-5542
> Project: Derby
> Issue Type: Improvement
> Components: Miscellaneous
> Affects Versions: 10.9.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Priority: Trivial
> Attachments: d5542.diff
>
>
> The code contains some checks for JVMInfo.JDK_ID >= JVMInfo.J2SE_14. That
> condition evaluates to true on all currently supported platforms (including
> on CDC/FP), so the checks can be removed.
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