如何打印完整的堆栈跟踪Java中

Question

的问题很简单，我想读的异常的全堆栈跟踪，我捕捉:)

例如：

org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot load JDBC driver class 'com.ibm.db2.jcc.DB2Driver' 
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1136) 
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880) 
at com.azurian.lce.usuarios.ConnectionManager.getConnection(ConnectionManager.java:65) 
at com.azurian.lce.usuarios.db2.UsuarioDAOImpl.autenticar(UsuarioDAOImpl.java:101) 
at com.azurian.lce.usuarios.UsuarioServiceImpl.autenticar(UsuarioServiceImpl.java:31) 
at com.azurian.lce.web.admin.actions.LoginAction.execute(LoginAction.java:49) 
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484) 
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274) 
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482) 
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) 
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
at java.lang.Thread.run(Unknown Source) 
Caused by: java.lang.ClassNotFoundException: COM.ibm.db2.jcc.DB2Driver 
at java.net.URLClassLoader$1.run(Unknown Source) 
at java.security.AccessController.doPrivileged(Native Method) 
at java.net.URLClassLoader.findClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at java.lang.ClassLoader.loadClass(Unknown Source) 
at java.lang.ClassLoader.loadClassInternal(Unknown Source) 
at java.lang.Class.forName0(Native Method) 
at java.lang.Class.forName(Unknown Source) 
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1130) 
... 23 more 

（我想读“...... 23多个”）

问候:)

Answer 1

答案很简单，那些线已经在堆栈跟踪:)

at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880) 
at com.azurian.lce.usuarios.ConnectionManager.getConnection(ConnectionManager.java:65) 
at com.azurian.lce.usuarios.db2.UsuarioDAOImpl.autenticar(UsuarioDAOImpl.java:101) 
at com.azurian.lce.usuarios.UsuarioServiceImpl.autenticar(UsuarioServiceImpl.java:31) 
at com.azurian.lce.web.admin.actions.LoginAction.execute(LoginAction.java:49) 
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484) 
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274) 
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482) 
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852) 
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
at java.lang.Thread.run(Unknown Source) 

基本上，以下是发生在BasicDataSource#createDataSource()：

try { 
    Class.forName(driverClassName); // Line 1130 
} catch (ClassNotFoundException e) { 
    throw new SQLNestedException(e, "Cannot load JDBC driver class '" + driverClassName + "'"); // Line 1136 
} 

Answer 2

BalusC是正确的。在这里看到：http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Throwable.html#printStackTrace()

特别是：

注含 字符线的存在 “...”。这些线 表明 堆栈跟踪此例外的其余部分相匹配 从 ，其通过本 异常（以下简称“封闭”的异常）引起的异常 的堆栈跟踪底部的指示的数量的帧。 此速记可以极大地减少 常见的 情况下的输出长度，其中包装的例外是 ，与 引发的“引发异常”相同。

这意味着在你的例子是：

BasicDataSource.java线1136抓到扔在行1130 ClassNotFoundException并重新抛出它作为一个SQLNestedException。因此，ClassNotFoundException的堆栈跟踪的其余部分与上面的SQLNestedException相匹配，并且stacktrace以更简洁的格式打印。

Answer 3

当外部异常（SQLNestedException）包装内部异常（ClassNotFoundError）时，它们位于同一个线程中，因此共享一个公共基址到它们的堆栈跟踪中。

（23更多...）显示了公共堆栈启动内部异常的位置，这也是引发外部异常的地方。所以，无论何时你看到（XX more ......），只要看看上面的异常就可以看到堆栈跟踪的其余部分。

如果您想以编程方式打印出没有常见曲线省略号的堆栈轨迹，那么您可以使用Throwable.getStackTrace()并自行打印出所有元素。

Answer 4

试试看。该逻辑遍历主异常及其所有原因，直到没有其他原因（cause == null）需要处理。这样你就可以避免23个以上的信息。我还没有测试过，但我相信这应该适合你。

顺便说一句 - logWriter是一个缓冲作家。您可能想要使用System.out.print或任何其他日志记录API。

public static void debugError(final String message, final Throwable th) { 
    final String logMessage = "[ERROR] - " + message; 

    try { 
     logWriter.write(logMessage); 
     logWriter.newLine(); 

     // dump exception stack if specified 
     if (null != th) { 
      final StackTraceElement[] traces = th.getStackTrace(); 
      if (null != traces && traces.length > 0) { 
       logWriter.write(th.getClass() + ": " + th.getMessage()); 
       logWriter.newLine(); 

       for (final StackTraceElement trace : traces) { 
        logWriter.write(" at " + trace.getClassName() + '.' + trace.getMethodName() + '(' + trace.getFileName() + ':' + trace.getLineNumber() + ')'); 
        logWriter.newLine(); 
       } 
      } 

      Throwable cause = th.getCause(); 
      while (null != cause) { 
       final StackTraceElement[] causeTraces = cause.getStackTrace(); 
       if (null != causeTraces && causeTraces.length > 0) { 
        logWriter.write("Caused By:"); 
        logWriter.newLine(); 
        logWriter.write(cause.getClass() + ": " + cause.getMessage()); 
        logWriter.newLine(); 

        for (final StackTraceElement causeTrace : causeTraces) { 
         logWriter.write(" at " + causeTrace.getClassName() + '.' + causeTrace.getMethodName() + '(' + causeTrace.getFileName() + ':' + causeTrace.getLineNumber() + ')'); 
         logWriter.newLine(); 
        } 
       } 

       // fetch next cause 
       cause = cause.getCause(); 
      } 
     } 
    } catch (final IOException ex) { 
     System.err.println(logMessage); 

     if (null != th) { 
      th.printStackTrace(); 
     } 
    } 
}