如何指定特定的JAXB实现？ [英] How to specify a particular JAXB implementation?
问题描述
似乎我过去已经做过一次这样的事情，但是我找不到任何关于我为使它工作所做的事情的参考。
It seems as though I have already done this once in the past, but I cannot find any reference to what I had done to get it to work.
I有一个Web应用程序，我想在其中指定一个不同于我的web服务器/ jre提供的JAXB实现。我从maven下载了相应的工件，并且看到jar在我的战争中正确打包，但是，当我启动我的Web应用程序时，我发现它仍在使用捆绑的JRE实现。
I have a web application in which I want to specify a different JAXB implementation than the one provided by my web server/jre. I downloaded the appropriate artifact from maven, and see that the jar is properly packaged in my war, however, when I start my web app, I see that it is still using the bundled JRE implementation.
我依旧记得有关我可以配置的属性文件的一些内容，但无法找到需要如何配置的参考。此外，如果我想要使用的实现是相同的（只是更新的版本），则类名称将与在JRE中打包的类型相同。如何指定我想使用WAR中捆绑的那些？
I vaguely remember something about a properties file that I could configure, but cannot find a reference to how it needs to be configured. Moreover, if the implementation I want to use is the same one (just a newer version), the class names would be the same as though packaged in the JRE. How can I specify that I want to use the ones bundled in my WAR?
编辑
我目前正在运行JBoss 7.0.2，使用Oracle JDK 1.6_0_27，JRE附带的JAXB RI（我认为它是v2.1）。我正在尝试升级到JAXB RI 2.2.5（在MvnRepository上找到）。
I'm currently running on JBoss 7.0.2, with Oracle JDK 1.6_0_27, JAXB RI that comes with the JRE (I think it is v2.1). I'm trying to upgrade to JAXB RI 2.2.5 (found on MvnRepository).
今天早上我做了一点挖掘，并在我的日志中发现了一条奇怪的错误消息：
I've done a little more digging this morning, and noticed a strange error message in my logs:
09:43:18,325 WARN [org.jboss.as.server.deployment] (MSC service thread 1-12) Class Path entry jaxb-api.jar in "/C:/servers/jboss-as-7.0.2.Final/standalone/deployments/LendingSimulationServiceEAR.ear/LendingSimulationService.war/WEB-INF/lib/jaxb-impl-2.2.5.jar" does not point to a valid jar for a Class-Path reference.
09:43:18,325 WARN [org.jboss.as.server.deployment] (MSC service thread 1-12) Class Path entry activation.jar in "/C:/servers/jboss-as-7.0.2.Final/standalone/deployments/LendingSimulationServiceEAR.ear/LendingSimulationService.war/WEB-INF/lib/jaxb-impl-2.2.5.jar" does not point to a valid jar for a Class-Path reference.
09:43:18,326 WARN [org.jboss.as.server.deployment] (MSC service thread 1-12) Class Path entry jsr173_1.0_api.jar in "/C:/servers/jboss-as-7.0.2.Final/standalone/deployments/LendingSimulationServiceEAR.ear/LendingSimulationService.war/WEB-INF/lib/jaxb-impl-2.2.5.jar" does not point to a valid jar for a Class-Path reference.
09:43:18,326 WARN [org.jboss.as.server.deployment] (MSC service thread 1-12) Class Path entry jaxb1-impl.jar in "/C:/servers/jboss-as-7.0.2.Final/standalone/deployments/LendingSimulationServiceEAR.ear/LendingSimulationService.war/WEB-INF/lib/jaxb-impl-2.2.5.jar" does not point to a valid jar for a Class-Path reference.
我觉得很奇怪。我不知道它在哪里找到这些信息。稍微研究一下在MANIFEST.MF中找到了这一行：
Which I found very strange. I wasn't sure where it was finding that information. A little more research found this line in the MANIFEST.MF:
Class-Path: jaxb-api.jar activation.jar jsr173_1.0_api.jar jaxb1-impl.jar
所以现在我比以前更加困惑。似乎jaxb实现依赖于api，activation，jsr和jaxb1实现jar。但它们没有列在jaxb pom中。在网上进行了一些挖掘，发现我这个链接讨论了如何在Java6SE中使用JAXB 2.2环境。不幸的是，这似乎也没有用;我仍然收到上面的WARN消息。
So now I'm even more confused than ever. It would appear that the jaxb implementation depends on the api, activation, jsr and jaxb1 implementation jars. But they aren't listed in the jaxb pom. A little digging online found me this link which discusses how to use JAXB 2.2 in a Java6SE environment. Unfortunately, this has not seemed to work either; I still get the above WARN messages.
我正在使用以下代码片段列出正在运行的JAXB实现;也许这是不正确的？
I'm using the following snippet to list the JAXB implementation that is running; perhaps this is incorrect?
/**
* Print the JAXB Implementation information
*/
public static void outputJaxpImplementationInfo() {
logger.debug(getImplementationInfo("DocumentBuilderFactory", DocumentBuilderFactory.newInstance().getClass()));
logger.debug(getImplementationInfo("XPathFactory", XPathFactory.newInstance().getClass()));
logger.debug(getImplementationInfo("TransformerFactory", TransformerFactory.newInstance().getClass()));
logger.debug(getImplementationInfo("SAXParserFactory", SAXParserFactory.newInstance().getClass()));
}
/**
* Get the JAXB implementation information for a particular class
* @param componentName
* @param componentClass
* @return
*/
private static String getImplementationInfo(String componentName, Class componentClass) {
CodeSource source = componentClass.getProtectionDomain().getCodeSource();
return MessageFormat.format(
"{0} implementation: {1} loaded from: {2}",
componentName,
componentClass.getName(),
source == null ? "Java Runtime" : source.getLocation());
}
此代码段产生以下日志：
This snippet produces the following log:
10:28:27,402 INFO [stdout] (MSC service thread 1-14) 2012-04-04 10:28:27,402 DEBUG cws.cs.lendingsimulationservice.util.JAXBUtil - DocumentBuilderFactory implementation: __redirected.__DocumentBuilderFactory loaded from: file:/C:/servers/jboss-as-7.0.2.Final/jboss-modules.jar
10:28:27,403 INFO [stdout] (MSC service thread 1-14) 2012-04-04 10:28:27,403 DEBUG cws.cs.lendingsimulationservice.util.JAXBUtil - XPathFactory implementation: __redirected.__XPathFactory loaded from: file:/C:/servers/jboss-as-7.0.2.Final/jboss-modules.jar
10:28:27,404 INFO [stdout] (MSC service thread 1-14) 2012-04-04 10:28:27,404 DEBUG cws.cs.lendingsimulationservice.util.JAXBUtil - TransformerFactory implementation: __redirected.__TransformerFactory loaded from: file:/C:/servers/jboss-as-7.0.2.Final/jboss-modules.jar
10:28:27,406 INFO [stdout] (MSC service thread 1-14) 2012-04-04 10:28:27,406 DEBUG cws.cs.lendingsimulationservice.util.JAXBUtil - SAXParserFactory implementation: __redirected.__SAXParserFactory loaded from: file:/C:/servers/jboss-as-7.0.2.Final/jboss-modules.jar
推荐答案
注意：我是< a href =http://www.eclipse.org/eclipselink/moxy.php> EclipseLink JAXB（MOXy） 领导和JAXB 2（JSR-222） 专家组。
Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB 2 (JSR-222) expert group.
要指定除默认值之外的JAXB（JSR-222）实现，您需要在与域类相同的包中包含名为 jaxb.properties 的文件。以下是用于指定JAXB的MOXy实现的 jaxb.properties 文件的示例：
To specify a JAXB (JSR-222) implementation other than the default you need to include a file called jaxb.properties in the same package as your domain classes. The following is an example of the jaxb.properties file used to specify the MOXy implementation of JAXB:
javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory
更多信息
- http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html
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