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https://issues.apache.org/jira/browse/CHAIN-57?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102691#comment-13102691
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Sebb commented on CHAIN-57:
---------------------------
I just committed an alternate fix that works for me on Sun Java 1.5, but does
not require an unchecked cast
> Chain 2.0 does not build on older JDKs
> --------------------------------------
>
> Key: CHAIN-57
> URL: https://issues.apache.org/jira/browse/CHAIN-57
> Project: Commons Chain
> Issue Type: Bug
> Affects Versions: 2.0
> Environment: OS name: "linux" version: "2.6.35-30-generic" arch:
> "amd64" Family: "unix"
> Ubuntu 10.10 x64
> Versions Tested:
> {noformat}
> ibm-java2-x86_64-50 (1.5 j9vmxa6423ifx-20110624) [SUCCESS]
> Sun/Oracle 1.5.0_22 [FAILURE]
> OpenJdk 1.6.0_20 [SUCCESS]
> Sun/Oracle 1.6.0_11 [FAILURE]
> Sun/Oracle 1.6.0_21 [FAILURE]
> Sun/Oracle 1.6.0_27 [SUCCESS]
> ibm-java-x86_64-60 (1.6 jvmxa6460-20081105_25433) [FAILURE]
> ibm-java-x86_64-60 (1.6 jvmxa6460sr9-20110624_85526) [SUCCESS]
> {noformat}
> Reporter: Elijah Zupancic
> Priority: Minor
>
> Older versions of the JDK irrespective of vendor fail to compile chain v2.
> I recommend that we do not do any code changes, but rather inform the users
> in the documentation to compile with a newer JDK version.
> The following is the typical output of a failed build. This particular output
> is when I tried to build using the Sun/Oracle JDK 1.6.0_21.
> {noformat}
> mvn clean package
> [INFO] Scanning for projects...
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Building Commons Chain
> [INFO] task-segment: [clean, package]
> [INFO]
> ------------------------------------------------------------------------
> [INFO] artifact org.apache.maven.plugins:maven-idea-plugin: checking for
> updates from internal
> [INFO] Repository 'internal' will be blacklisted
> [INFO] [clean:clean {execution: default-clean}]
> [INFO] Deleting /home/elijah/dev/version-2.0-work/target
> [INFO] [antrun:run {execution: javadoc.resources}]
> [INFO] Executing tasks
> main:
> [copy] Copying 2 files to
> /home/elijah/dev/version-2.0-work/target/apidocs/META-INF
> [INFO] Executed tasks
> [INFO] Setting property: classpath.resource.loader.class =>
> 'org.codehaus.plexus.velocity.ContextClassLoaderResourceLoader'.
> [INFO] Setting property: velocimacro.messages.on => 'false'.
> [INFO] Setting property: resource.loader => 'classpath'.
> [INFO] Setting property: resource.manager.logwhenfound => 'false'.
> [INFO] [remote-resources:process {execution: default}]
> [INFO] [resources:resources {execution: default-resources}]
> [INFO] Using 'iso-8859-1' encoding to copy filtered resources.
> [INFO] Copying 2 resources to META-INF
> [INFO] [compiler:compile {execution: default-compile}]
> [INFO] Compiling 63 source files to
> /home/elijah/dev/version-2.0-work/target/classes
> [INFO] [bundle:manifest {execution: bundle-manifest}]
> [WARNING] Warning in manifest for
> commons-chain:commons-chain:jar:2.0-SNAPSHOT : Did not find matching referal
> for !javax.portlet
> [INFO] [resources:testResources {execution: default-testResources}]
> [INFO] Using 'iso-8859-1' encoding to copy filtered resources.
> [INFO] Copying 2 resources
> [INFO] [compiler:testCompile {execution: default-testCompile}]
> [INFO] Compiling 37 source files to
> /home/elijah/dev/version-2.0-work/target/test-classes
> [INFO] -------------------------------------------------------------
> [ERROR] COMPILATION ERROR :
> [INFO] -------------------------------------------------------------
> [ERROR]
> /home/elijah/dev/version-2.0-work/src/test/java/org/apache/commons/chain/generic/DispatchCommandTestCase.java:[141,42]
> type parameters of <T>T cannot be determined; no unique maximal instance
> exists for type variable T with upper bounds T,java.lang.Object
> [INFO] 1error
> [INFO] -------------------------------------------------------------
> [INFO]
> ------------------------------------------------------------------------
> [ERROR] BUILD FAILURE
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Compilation failure
> /home/elijah/dev/version-2.0-work/src/test/java/org/apache/commons/chain/generic/DispatchCommandTestCase.java:[141,42]
> type parameters of <T>T cannot be determined; no unique maximal instance
> exists for type variable T with upper bounds T,java.lang.Object
> [INFO]
> ------------------------------------------------------------------------
> [INFO] For more information, run Maven with the -e switch
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Total time: 15 seconds
> [INFO] Finished at: Wed Sep 07 08:09:12 PDT 2011
> [INFO] Final Memory: 51M/300M
> [INFO]
> ------------------------------------------------------------------------
> {noformat}
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