Java 自定义Tomcat领域：ClassNotFoundException

我正在使用EclipseVirgo（3.6.1）OSGi容器，它在Tomcat7.0.31上运行。我试图根据实现自定义身份验证领域，但在尝试启动服务器时遇到

ClassNotFoundException

我的领域实现非常简单；它只是扩展了

jdbcream

并覆盖了

authenticate

方法。根据文档，我将这个类编译成一个jar，标题为

com.authentication.MyCustomRealm.jar

，并将它放在$SERVER\u HOME/lib中

我添加到tomcat-server.xml的配置如下：

<Realm className="com.authentication.MyCustomRealm"
  resourceName="Custom Realm"
  driverName="{jdbc.driverClassName}"
  dbConnectionName="{jdbc.username}"
  dbConnectionPassword="{jdbc.password}"
  dbConnectionURL="{jdbc.url}"
  userTable="USER_DATA"
  userNameCol="ID" />
</Realm>

---

我怀疑我需要对我的OSGi配置做一些特殊的事情才能找到类，但我不确定到底是什么。

从堆栈跟踪中，我发现，

org.eclipse.gemini.web.tomcat

捆绑包试图加载我的自定义域。我的解决方案是创建一个新的片段包，它使用

org.eclipse.gemini.web.tomcat

作为主机。我将我的自定义域放在这个包中，解决了这个异常

org.xml.sax.SAXParseException: Error at (103, 40) : com.authentication.MyCustomRealm
    at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2687)
    at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2719)
    at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1279)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:506)
    at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:182)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1303)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2717)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:607)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:489)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:835)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
    at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1210)
    at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:568)
    at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1556)
    at org.eclipse.gemini.web.tomcat.internal.OsgiAwareEmbeddedTomcat.configure(OsgiAwareEmbeddedTomcat.java:309)
    ... 42 common frames omitted com.authentication.MyCustomRealm 
    at org.eclipse.gemini.web.tomcat.internal.loading.ChainedClassLoader.doLoadClass(ChainedClassLoader.java:181)
    at org.eclipse.gemini.web.tomcat.internal.loading.ChainedClassLoader.loadClass(ChainedClassLoader.java:164)
    at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRule.java:144)
    at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1276)

Caused by: java.lang.ClassNotFoundException: com.authentication.MyCustomRealm
    at org.eclipse.gemini.web.tomcat.internal.loading.ChainedClassLoader.doLoadClass(ChainedClassLoader.java:181)
    at org.eclipse.gemini.web.tomcat.internal.loading.ChainedClassLoader.loadClass(ChainedClassLoader.java:164)
    at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRule.java:144)
    at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1276)
    ... 55 common frames omitted