執行Stored Proc時發生運行時異常java.lang.ClassNotFoundException

當我嘗試從weblogic執行Pointbase中的存儲過程時，出現以下錯誤。執行Stored Proc時發生運行時異常java.lang.ClassNotFoundException

java.sql.SQLException: The external "DbLog::insLog" routine had the following runtime exception "java.lang.ClassNotFoundException: DbLog"

所以我設置好的類路徑中commEnv.cmd如下，

set POINTBASE_HOME=%WL_HOME%\common\eval\pointbase 
set POINTBASE_CLIENT_CLASSPATH=%POINTBASE_HOME%\lib\pbclient57.jar 
set POINTBASE_CLASSPATH=%POINTBASE_HOME%\lib\pbembedded57.jar;%POINTBASE_CLIENT_CLASSPATH%;C:\bea\user_projects\workspaces\work1\utility\build\classes 
set POINTBASE_TOOLS=%POINTBASE_HOME%\lib\pbtools57.jar

我DBLOG類是在路徑C：\ BEA \ user_projects \工作區\工作1 \ UTIL \建立\班\ net \ local \ util \ common FYI，net \ local \ util \ common是包結構。

但是，當我嘗試執行它調用RequestFilter.java的頁面，我收到以下錯誤，

Error 500--Internal Server Error 
java.lang.NoClassDefFoundError: Could not initialize class net.local.util.common.DbLog

--RequestFilter.java

import net.local.util.common.DbLog; 

    public final class RequestFilter { 

    public void log() { 

    DbLog dblog = new DbLog(); 
    dblog.logPreAuth(); 
    } 
    }

--DbLog.java

package net.local.util.common; 

    import java.sql.*; 
    import org.apache.log4j.Logger; 
    import com.pointbase.jdbc.*; 


    public class DbLog { 


     private static final Logger logger = Logger.getLogger(DbLog.class); 
     private static boolean DEBUGGING = logger.isDebugEnabled(); 
     private Connection conn = null; 
     private Statement m_stmt; 
     private Statement l_stmt; 
     private CallableStatement m_callStmt = null; 
     //static ResultSet l_rs = null; 

public DbLog() { 

     logger.info("DbLog constructor called"); 
     init(); 

    } 

    public void init() { 
     logger.info("DbLog init called"); 
    } 




    public void logPreAuth() { 

      try { 
       logger.info("Inside logPreAuth method"); 



       String I_URL = "jdbc:pointbase:server://localhost:9093/weblogic_eval"; 
       Class.forName("com.pointbase.jdbc.jdbcUniversalDriver").newInstance(); 
       //Class.forName("com.pointbase.jdbc.jdbcDataSource"); 
       conn = DriverManager.getConnection(I_URL, "PBPUBLIC", "PBPUBLIC"); 

      String SQL_CREATE_PROC = "CREATE PROCEDURE insLog(IN P1 VARCHAR(30))" 
        + " LANGUAGE JAVA" 
        + " SPECIFIC insLog" 
        + " DETERMINISTIC" 
        + " NO SQL" 
        + " EXTERNAL NAME \"DbLog::insLog\"" 
        + " PARAMETER STYLE SQL";  


       m_stmt = conn.createStatement(); 
       m_stmt.executeUpdate(SQL_CREATE_PROC); 
       m_stmt.close();  
       m_callStmt = conn.prepareCall("{ call PBPUBLIC.insLog(?) }"); 
       m_callStmt.setString(1, "Success!!"); 
       m_callStmt.execute();  

      } 


      catch (Exception e) { 
       logger.error("Error in logPreAuth method" + e); 
      } 


     } 

    public void insLog(String test) 
    { 
     try { 

      l_stmt = conn.createStatement(); 
      l_stmt.execute("Insert into logs values('" + test + "')"); 
      l_stmt.close(); 
      conn.close(); 
     } 
     catch (Exception e) { 

     } 

    } 
    }

來源

2012-03-07 a a

真正的錯誤是進一步在堆棧跟蹤。發佈整個堆棧跟蹤。 – 2012-03-07 20:50:56

java.lang.NoClassDefFoundError: Could not initialize class net.local.util.common.DbLog

這基本上米意味着Class.forName("net.local.util.common.DbLog")失敗，併發生異常。這反過來可能意味着有問題的類的任何static變量或初始化塊都會拋出未處理的異常。它們是在上課時執行的。

您在該類已經兩個：這樣

private static final Logger logger = Logger.getLogger(DbLog.class); 
private static boolean DEBUGGING = logger.isDebugEnabled();

他們要麼已拋出異常。它的堆棧跟蹤在日誌中進一步可見。回去閱讀您的日誌並檢查堆棧跟蹤的最底層異常。這是第一個根本原因。它應該足夠自我解釋。也許在運行時類路徑中缺少Log4j等等。

來源

2012-03-07 20:42:37 BalusC

執行Stored Proc時發生運行時異常java.lang.ClassNotFoundException

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