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https://issues.apache.org/jira/browse/DERBY-4458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13107874#comment-13107874
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Dag H. Wanvik commented on DERBY-4458:
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The -source 1.4 is there to make sure that developer's don't accidentally slip
Java code in that requires a higher level than 1.4. I believe the code will
compile just fine with a newer compiler modulo the JDBC interface: Java 6 comes
with JDBC 4, so implementations of JDBC interfaces need special care, cf. the
versioned source code in the Derby client, e.g. ClientPooledConnection40 which
extends ClientPooledConnection etc. The former (*40.java) is already compiled
with a Java 6 compiler. The -target 1.4 is to ensure the resulting byte code
will run on Java 1.4. We did not want to release separate jars for each Java
level.
> Dalvik / Andoid compatibility
> -----------------------------
>
> Key: DERBY-4458
> URL: https://issues.apache.org/jira/browse/DERBY-4458
> Project: Derby
> Issue Type: Improvement
> Components: Miscellaneous
> Affects Versions: 10.5.3.0
> Environment: dx 1.2 (from the Android SDK 2.0) running on Java 1.6
> Reporter: Thomas Görres
>
> derby.jar cannot be used on mobile devices running the Android OS. Android
> uses Dalvik as runtime environment, and the classfiles from derby.jar cannot
> be translated to Dalvik byte code.
> Steps to repeat:
> 1. get the Android SDK from http://developer.android.com
> 2. navigate to [android-sdk]/platforms/android-1.5/tools
> 3. execute ./dx --dex path/to/derby.jar
> The dx tool should convert the JRE byte code to Dalvik byte code. Instead, it
> spits out this warning several time:
> warning: Ignoring InnerClasses attribute for an anonymous inner class that
> doesn't come with an associated EnclosingMethod attribute. (This class was
> probably produced by a broken compiler.)
> Then it runs out of memory:
> java.lang.OutOfMemoryError: Java heap space
> at
> com.android.dx.rop.code.ThrowingInsn.withNewRegisters(ThrowingInsn.java:116)
> at com.android.dx.ssa.NormalSsaInsn.toRopInsn(NormalSsaInsn.java:122)
> at com.android.dx.ssa.back.SsaToRop.convertInsns(SsaToRop.java:386)
> at com.android.dx.ssa.back.SsaToRop.convertBasicBlock(SsaToRop.java:365)
> at
> com.android.dx.ssa.back.SsaToRop.convertBasicBlocks(SsaToRop.java:300)
> at com.android.dx.ssa.back.SsaToRop.convertToRop(SsaToRop.java:277)
> at com.android.dx.ssa.back.SsaToRop.convert(SsaToRop.java:118)
> at com.android.dx.ssa.back.SsaToRop.convertToRopMethod(SsaToRop.java:71)
> at com.android.dx.ssa.Optimizer.optimize(Optimizer.java:103)
> at com.android.dx.ssa.Optimizer.optimize(Optimizer.java:74)
> at
> com.android.dx.dex.cf.CfTranslator.processMethods(CfTranslator.java:269)
> at com.android.dx.dex.cf.CfTranslator.translate0(CfTranslator.java:131)
> at com.android.dx.dex.cf.CfTranslator.translate(CfTranslator.java:85)
> at com.android.dx.command.dexer.Main.processClass(Main.java:297)
> at com.android.dx.command.dexer.Main.processFileBytes(Main.java:276)
> at com.android.dx.command.dexer.Main.access$100(Main.java:56)
> at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:228)
> at
> com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:245)
> at
> com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:130)
> at
> com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:108)
> at com.android.dx.command.dexer.Main.processOne(Main.java:245)
> at com.android.dx.command.dexer.Main.processAllFiles(Main.java:183)
> at com.android.dx.command.dexer.Main.run(Main.java:139)
> at com.android.dx.command.dexer.Main.main(Main.java:120)
> at com.android.dx.command.Main.main(Main.java:87)
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