Oracle Seeker, Oracle探索者

在经过近期的连续加班，项目最后阶段的开发终于完成，并于前天晚上顺利实施上线，上线后就凌晨2点钟了，虽然身体有些疲惫，心理却轻松了很多。可是没想到早晨来上班，刚走到客户公司楼下，就接到电话说正式环境的服务器当掉了，跑到楼上打开电脑下载正式环境的服务器日志，发现了如下异常信息：

<Sep 28, 2009 9:55:16 AM CST> <Critical> <Server> <BEA-002616> <Failed to listen on channel "Default" on ****.*.*.*:****, failure count: 1, failing for 0 seconds, java.net.SocketException: Too many open files>
<Sep 28, 2009 9:55:16 AM CST> <Error> <HTTP> <BEA-101019> <[weblogic.servlet.internal.WebAppServletContext@6c086c08 - appName: 'consoleapp', name: 'console', context-path: '/console', spec-version: '2.5'] Servlet failed with IOException
java.io.FileNotFoundException: /***/wlserver_10.3/server/lib/consoleapp/webapp/images/sort_up.gif (Too many open files)
    at java.io.FileInputStream.open(Native Method)
    at java.io.FileInputStream.<init>(FileInputStream.java:112)
    at weblogic.utils.classloaders.FileSource.getInputStream(FileSource.java:31)
    at weblogic.servlet.internal.WarSource.getInputStream(WarSource.java:65)
    at weblogic.servlet.FileServlet.sendFile(FileServlet.java:400)
    Truncated. see log file for complete stacktrace
>

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昨天在项目中遇到了一个非常棘手的异常，将开发好的应用发布到WebLogic中，发现日志中产生如下异常提示信息：

<Sep 15, 2009 9:44:17 AM IRKST> <Critical> <WebLogicServer> <BEA-000386> <Server subsystem failed. Reason: javax.xml.parsers.FactoryConfigurationError: Provider com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl not found
javax.xml.parsers.FactoryConfigurationError: Provider com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl not found
at javax.xml.parsers.SAXParserFactory.newInstance(Unknown Source)
at org.apache.openjpa.lib.xml.XMLFactory.<clinit>(XMLFactory.java:60)
at java.lang.J9VMInternals.initializeImpl(Native Method)
at java.lang.J9VMInternals.initialize(J9VMInternals.java:200)
at org.apache.openjpa.lib.meta.XMLMetaDataParser.parseNewResource(XMLMetaDataParser.java:352)
Truncated. see log file for complete stacktrace
>
<Sep 15, 2009 9:44:17 AM IRKST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to FAILED>
<Sep 15, 2009 9:44:17 AM IRKST> <Error> <WebLogicServer> <BEA-000383> <A critical service failed. The server will shut itself down>
<Sep 15, 2009 9:44:17 AM IRKST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to FORCE_SHUTTING_DOWN>

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近日，在项目的实施过程中遇到了以下问题：

INFO: couldn’t set dynamic validation feature org.xml.sax.SAXNotRecognizedException: SAX feature ‘http://apache.org/xml/features/validation/dynamic’ not recognized. ……

仔细分析一下，发现该错误的原因是WebLogic 10.3版本中的XML解析器出了问题，在WebLogic Server 10.3中，weblogic.jar里的META-INF/services/javax.xml.parsers.SAXParserFactory指定了默认的SAX Parser类，即weblogic.xml.jaxp.RegistrySAXParserFactory。

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