开发学院软件开发Java 关于weblogic中使用Dom4j、Xerces导致执行线程挂起... 阅读

关于weblogic中使用Dom4j、Xerces导致执行线程挂起的问题

 2009-09-22 00:00:00 来源:WEB开发网   
核心提示: 我们可以看看SAXParserFactory.newInstance()的实现,1publicstaticSAXParserFactorynewInstance()2throwsFactoryConfigurationError3{4try5{6return(SAXParserFactory)F

我们可以看看SAXParserFactory.newInstance()的实现,

 1     public static SAXParserFactory newInstance()
 2         throws FactoryConfigurationError
 3     {
 4         try
 5         {
 6             return (SAXParserFactory)FactoryFinder.find("javax.xml.parsers.SAXParserFactory", "org.apache.xerces.jaxp.SAXParserFactoryImpl");
 7         }
 8         catch(FactoryFinder.ConfigurationError configurationerror)
 9         {
10             throw new FactoryConfigurationError(configurationerror.getException(), configurationerror.getMessage());
11         }
12     }

再来看看FactoryFinder.find()的实现,

 1     static Object find(String s, String s1)
 2         throws ConfigurationError
 3     {
 4         debugPrintln("debug is on");
 5         ClassLoader classloader = findClassLoader();
 6         try
 7         {
 8             String s2 = System.getProperty(s);
 9             if(s2 != null)
10             {
11                 debugPrintln("found system property " + s2);
12                 return newInstance(s2, classloader);
13             }
14         }
15         catch(SecurityException _ex) { }
16         try
17         {
18             String s3 = System.getProperty("java.home");
19             String s5 = s3 + File.separator + "lib" + File.separator + "jaxp.properties";
20             File file = new File(s5);
21             if(file.exists())
22             {
23                 Properties properties = new Properties();
24                 properties.load(new FileInputStream(file));
25                 String s7 = properties.getProperty(s);
26                 debugPrintln("found java.home property " + s7);
27                 return newInstance(s7, classloader);
28             }
29         }
30         catch(Exception exception) { }
31         String s4 = "META-INF/services/" + s;
32         try
33         {
34             java.io.InputStream inputstream = null;
35             if(classloader == null)
36                 inputstream = ClassLoader.getSystemResourceAsStream(s4);
37             else
38                 inputstream = classloader.getResourceAsStream(s4);
39             if(inputstream != null)
40             {
41                 debugPrintln("found " + s4);
42                 BufferedReader bufferedreader;
43                 try
44                 {
45                     bufferedreader = new BufferedReader(new InputStreamReader(inputstream, "UTF-8"));
46                 }
47                 catch(UnsupportedEncodingException _ex)
48                 {
49                     bufferedreader = new BufferedReader(new InputStreamReader(inputstream));
50                 }
51                 String s6 = bufferedreader.readLine();
52                 bufferedreader.close();
53                 if(s6 != null && !"".equals(s6))
54                 {
55                     debugPrintln("loaded from services: " + s6);
56                     return newInstance(s6, classloader);
57                 }
58             }
59         }
60         catch(Exception exception1) { }
61         if(s1 == null)
62         {
63             throw new ConfigurationError("Provider for " + s + " cannot be found", null);
64         } else
65         {
66             debugPrintln("loaded from fallback value: " + s1);
67             return newInstance(s1, classloader);
68         }
69     }
70 

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