Question

当我尝试从weblogic执行Pointbase中的存储过程时，我收到以下错误。

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

所以我在commEnv.cmd中设置了类路径，如下所示，

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

我的DbLog类位于路径中，C：\ bea \ user_projects \ workspaces \ Work1 \ util \ build \ classes \ net \ local \ util \ common FYI，net \ local \ util \ common是包结构。< / p>

但是当我尝试执行调用RequestFilter.java的页面时，我收到以下错误，

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) {   

        }   

    }   
    }

Answer 1

java.lang.NoClassDefFoundError：无法初始化类net.local.util.common.DbLog

这基本上意味着Class.forName("net.local.util.common.DbLog")因异常而失败。这可能反过来意味着所讨论的类的任何static变量或初始化程序块都抛出了未处理的异常。它们即在类加载期间执行。

你在班上有两个人：

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

他们中的任何一个都因此抛出异常。它的堆栈跟踪在日志中可以进一步显示。返回读取日志并检查堆栈跟踪的最底层异常。这是第一个根本原因。应该足够自我解释。也许运行时类路径中缺少Log4j。

执行存储过程时的运行时异常java.lang.ClassNotFoundException

1 个答案: