【发布时间】：2015-03-05 16:25:29
【问题描述】：
XJC（XML Java 编译器）是 JAXB（Java XML 绑定）的一部分。
如果我查看official website，最新版本的JAXB 似乎是2.2.11。这就是您刚刚安装最新的 JDK 版本 8u40 时得到的那个。
以下输出显示了与JDK 8u40相关的XJC版本：
../JDK8u40/bin$ ./javac -version
javac 1.8.0_40
../JDK8u40/bin$ ./xjc -version
xjc 2.2.8-b130911.1802
（原始 JDK 路径因操作系统而异，因此这只是一个示例性表示。）
XJC 的版本似乎与“最新的”JAXB 版本不同，或者最新的 JDK 不包含最新的 JAXB 版本。
我的解决方法是从Maven repository 安装最新的 JAXB 版本。听起来很简单，但是为什么 JAXB 的最新版本现在是 2.2.12 呢？忘记将文档放在官方网站上？好吧，我只是试着不在乎......在成功安装过程后，我注意到这个包内没有 XJC。所以继续搜索...我找到了另一个名为“JAXB-XJC”的 Maven 存储库。但这只是源代码。我只是想安装 XJC 的最新二进制文件。我看了下版本号，2.2.11。这看起来至少比 2.2.8 好。
但是我在哪里可以获得 XJC 的最新二进制文件？
为什么要安装最新的XJC二进制文件？因为我想知道它是否支持 Java 8 的 Optionals 和/或它是否支持 XSD 架构版本 1.1。我在 Internet 上的某个地方阅读了最新的 XJC 至少支持 XSD 架构版本 1.1。现在就足够了。但要弄清楚这一点，甲骨文似乎必须解决他们可怕的版本混乱问题。
更新
我尝试通过克隆官方Git repository 并做mvn clean install 来构建JAXB。
结果：
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] JAXB BOM ........................................... SUCCESS [ 0.140 s]
[INFO] JAXB BOM with ALL dependencies ..................... SUCCESS [ 0.005 s]
[INFO] JAXB Reference Implementation ...................... SUCCESS [ 0.515 s]
[INFO] JAXB External parent ............................... SUCCESS [ 0.009 s]
[INFO] RNGOM .............................................. SUCCESS [ 3.723 s]
[INFO] Codemodel .......................................... SUCCESS [ 0.008 s]
[INFO] Codemodel Core ..................................... SUCCESS [ 2.622 s]
[INFO] Codemodel Annotation Compiler ...................... SUCCESS [ 0.848 s]
[INFO] JAXB TXW parent .................................... SUCCESS [ 0.006 s]
[INFO] TXW2 Runtime ....................................... SUCCESS [ 1.920 s]
[INFO] TXW2 Compiler ...................................... SUCCESS [ 1.507 s]
[INFO] JAXB Core .......................................... SUCCESS [ 1.745 s]
[INFO] JAXB Runtime parent ................................ SUCCESS [ 0.008 s]
[INFO] JAXB Runtime ....................................... SUCCESS [ 5.932 s]
[INFO] JAXB1 Runtime ...................................... SUCCESS [ 1.520 s]
[INFO] JAXB XJC ........................................... SUCCESS [ 5.555 s]
[INFO] JAXB JXC ........................................... SUCCESS [ 2.928 s]
[INFO] Parent for osgi testing modules. ................... SUCCESS [ 0.009 s]
[INFO] osgi-test-parent ................................... SUCCESS [ 1.315 s]
[INFO] osgi-test-core ..................................... SUCCESS [ 0.676 s]
[INFO] JAXB bundles ....................................... SUCCESS [ 0.007 s]
[INFO] Old JAXB Core ...................................... SUCCESS [ 4.669 s]
[INFO] osgi-test-runtime .................................. SUCCESS [ 0.677 s]
[INFO] Old JAXB Runtime ................................... SUCCESS [ 3.251 s]
[INFO] osgi-test-xjc ...................................... SUCCESS [ 0.637 s]
[INFO] Old JAXB XJC ....................................... SUCCESS [ 4.385 s]
[INFO] osgi-test-jxc ...................................... SUCCESS [ 0.607 s]
[INFO] Old JAXB JXC ....................................... SUCCESS [ 2.169 s]
[INFO] JAXB Documentation parent .......................... SUCCESS [ 0.005 s]
[INFO] JAXB Release Documentation ......................... SUCCESS [ 12.401 s]
[INFO] JAXB samples ....................................... SUCCESS [ 0.375 s]
[INFO] JAXB RI ............................................ SUCCESS [ 1.079 s]
[INFO] JAXB OSGI parent ................................... SUCCESS [ 0.005 s]
[INFO] JAXB extra OSGI .................................... FAILURE [ 6.668 s]
[INFO] JAXB OSGI .......................................... SKIPPED
[INFO] osgi-test-osgi ..................................... SKIPPED
[INFO] osgi-test-extra_osgi ............................... SKIPPED
[INFO] JAXB OSGi Tests .................................... SKIPPED
[INFO] JAXB WWW Help files ................................ SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:08 min
[INFO] Finished at: 2015-03-11T15:40:59+01:00
[INFO] Final Memory: 83M/1546M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-shade-plugin:2.0:shade (default) on project jaxb-extra-osgi: Error creating shaded jar: java.util.jar.Attributes cannot be cast to java.lang.String -> [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/MojoExecutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :jaxb-extra-osgi
构建过程总是在 JAXB extra OSGI 目标处失败。 JAXB XJC 目标构建成功，但只包含一个抛出异常的 jar 文件，但没有名为 xjc 的二进制文件。那么它在哪里呢？
【问题讨论】：