herokuにJavaアプリをデプロイ…のはずが、mavenの勉強で終わってしまった件

herokuがJavaに対応ということで、試してみました。

結果ですが、

Mavenが全然わからないレベルなので、herokuにJavaアプリをデプロイするところで凄い時間がかかってしまった…

Herokuのガイド通りにアプリを作成して、デプロイしたところ…

[INFO] ------------------------------------------------------------------------
       [INFO] BUILD FAILURE
       [INFO] ------------------------------------------------------------------------
       [INFO] Total time: 6.396s
       [INFO] Finished at: Sun Dec 04 11:26:33 UTC 2011
       [INFO] Final Memory: 9M/490M
       [INFO] ------------------------------------------------------------------------
       [ERROR] Failed to execute goal org.codehaus.mojo:appassembler-maven-plugin:1.1:assemble (default) on project orz.mikeneck.heroku.first: A type incompatibility occured while executing org.codehaus.mojo:appassembler-maven-plugin:1.1:assemble: java.lang.String cannot be cast to org.codehaus.mojo.appassembler.Program
       [ERROR] -----------------------------------------------------
       [ERROR] realm =    plugin>org.codehaus.mojo:appassembler-maven-plugin:1.1
       [ERROR] strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
       [ERROR] urls[0] = file:/app/tmp/repo.git/.cache/.m2/repository/org/codehaus/mojo/appassembler-maven-plugin/1.1/appassembler-maven-plugin-1.1.jar
       [ERROR] urls[1] = file:/app/tmp/repo.git/.cache/.m2/repository/org/codehaus/mojo/appassembler/appassembler-model/1.1/appassembler-model-1.1.jar
       [ERROR] urls[2] = file:/app/tmp/repo.git/.cache/.m2/repository/net/java/dev/stax-utils/stax-utils/20060502/stax-utils-20060502.jar
       [ERROR] urls[3] = file:/app/tmp/repo.git/.cache/.m2/repository/stax/stax/1.1.1-dev/stax-1.1.1-dev.jar
       [ERROR] urls[4] = file:/app/tmp/repo.git/.cache/.m2/repository/org/codehaus/plexus/plexus-utils/1.5.6/plexus-utils-1.5.6.jar
       [ERROR] urls[5] = file:/app/tmp/repo.git/.cache/.m2/repository/stax/stax-api/1.0.1/stax-api-1.0.1.jar
       [ERROR] Number of foreign imports: 1
       [ERROR] import: Entry[import  from realm ClassRealm[maven.api, parent: null]]
       [ERROR] 
       [ERROR] -----------------------------------------------------
       [ERROR] -> [Help 1]
       [ERROR] 
       [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
       [ERROR] Re-run Maven using the -X switch to enable full debug logging.
       [ERROR] 
       [ERROR] For more information about the errors and possible solutions, please read the following articles:
       [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException
 !     Failed to build app with Maven
 !     Heroku push rejected, failed to compile Java app

おそらくmavenをちゃんと知っている人なら、たやすく回避できるんだろうな。

で、ググっていたら同じ問題を抱えていた人のブログを発見。

herokuのガイドのmavenの記述に誤りがあるらしいです。

誤

<build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>appassembler-maven-plugin</artifactId>
                <version>1.1.1</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals><goal>assemble</goal></goals>
                        <configuration>
                            <assembleDirectory>target</assembleDirectory>
                            <generateRepository>false</generateRepository>
                            <programs>
                                <program>
                                    <mainClass>HelloWorld</mainClass>
                                    <name>webapp</name>
                                </program>
                            </programs>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

正

<build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>appassembler-maven-plugin</artifactId>
                <version>1.1.1</version>
                <configuration>
                    <assembleDirectory>target</assembleDirectory>
                    <programs>
                        <program>
                            <mainClass>orz.mikeneck.heroku.first.HerokuServer</mainClass>
                            <name>webapp</name>
                        </program>
                    </programs>
                </configuration>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>assemble</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.6</source>
                    <target>1.6</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

まとめると、こんな感じです。

• mavenではコンパイラーの指定がデフォルトで1.3になっているので、1.6に変更
• appassembler-maven-pluginの記述が微妙に間違っている