当我使用Jar文件和命令提示符时，jdbc有问题

问题描述

| 我使用JDeveloper开发JDBC程序，现在我的程序完成了，我想单独运行它。当我尝试从命令提示符运行我的jar文件时遇到问题。 当我使用命令提示符运行我的程序时，我的程序无法连接到我的oracle数据库！但是当我使用JDeveloper IDE时，没有任何问题！ 我的IDE运行以下命令：

javaw.exe -client -classpath C:\\JDeveloper\\mywork\\SourceManagmentTools\\.adf;C:\\JDeveloper\\mywork\\SourceManagmentTools\\Client\\classes;C:\\Oracle\\Middleware\\jdeveloper\\jdev\\lib\\jdev-rt.jar;C:\\JDeveloper\\mywork\\SourceManagmentTools\\Client\\ojdbc14.jar;C:\\JDeveloper\\mywork\\SourceManagmentTools\\Client\\quaqua-filechooser-only.jar;C:\\JDeveloper\\mywork\\SourceManagmentTools\\Client\\quaqua-test.jar;C:\\JDeveloper\\mywork\\SourceManagmentTools\\Client\\quaqua.jar;C:\\JDeveloper\\mywork\\SourceManagmentTools\\Client\\swing-layout.jar;C:\\JDeveloper\\mywork\\SourceManagmentTools\\Client\\image;C:\\JDeveloper\\mywork\\SourceManagmentTools\\Client\\lipstikLF-1.1.jar -Djavax.net.ssl.trustStore=C:\\Oracle\\Middleware\\wlserver_10.3\\server\\lib\\DemoTrust.jks Main.GUI.SmRun amir

我使用以下命令：

Java -jar smt.jar amir

当我运行IDE命令时，没有任何问题，一切正常，请您帮帮我吗？ （我的程序正在运行并且正在工作，只是我无法从数据库中获取数据） 当我尝试从数据库中选择时，出现以下错误...

C:\\JDeveloper\\mywork\\SourceManagmentTools\\Client\\deploy>java -jar smt.jar amir
[Ljava.lang.StackTraceElement;@7a148bd3[Ljava.lang.StackTraceElement;@51b48197[L
java.lang.StackTraceElement;@58ecb281[Ljava.lang.StackTraceElement;@25fa1bb6[Lja
va.lang.StackTraceElement;@62da3a1e[Ljava.lang.StackTraceElement;@15f48262[Ljava
.lang.StackTraceElement;@7dc05ffd[Ljava.lang.StackTraceElement;@15e232b5[Ljava.l
ang.StackTraceElement;@36baa466[Ljava.lang.StackTraceElement;@177f409c[Ljava.lan
g.StackTraceElement;@2b8bbc5a[Ljava.lang.StackTraceElement;@62facf0b[Ljava.lang.
StackTraceElement;@5ff3ce5c[Ljava.lang.StackTraceElement;@561777b1Exception in t
hread \"AWT-EventQueue-0\" java.lang.NullPointerException
        at Main.Database.SmDatabase.selectCustomers(SmDatabase.java:151)
        at Main.GUI.SmCreateProject.this_windowOpened(SmCreateProject.java:109)
        at Main.GUI.SmCreateProject.access$000(SmCreateProject.java:30)
        at Main.GUI.SmCreateProject$1.windowOpened(SmCreateProject.java:58)
        at java.awt.AWTEventMulticaster.windowOpened(UnkNown Source)
        at java.awt.Window.processWindowEvent(UnkNown Source)
        at javax.swing.jdialog.processWindowEvent(UnkNown Source)
        at java.awt.Window.processEvent(UnkNown Source)
        at java.awt.Component.dispatchEventImpl(UnkNown Source)
        at java.awt.Container.dispatchEventImpl(UnkNown Source)
        at java.awt.Window.dispatchEventImpl(UnkNown Source)
        at java.awt.Component.dispatchEvent(UnkNown Source)
        at java.awt.EventQueue.dispatchEventImpl(UnkNown Source)
        at java.awt.EventQueue.access$000(UnkNown Source)
        at java.awt.EventQueue$1.run(UnkNown Source)
        at java.awt.EventQueue$1.run(UnkNown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(UnkNown
Source)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(UnkNown
Source)
        at java.awt.EventQueue$2.run(UnkNown Source)
        at java.awt.EventQueue$2.run(UnkNown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(UnkNown
Source)
        at java.awt.EventQueue.dispatchEvent(UnkNown Source)
        at java.awt.EventdispatchThread.pumpOneEventForFilters(UnkNown Source)
        at java.awt.EventdispatchThread.pumpEventsForFilter(UnkNown Source)
        at java.awt.EventdispatchThread.pumpEventsForHierarchy(UnkNown Source)
        at java.awt.EventdispatchThread.pumpEvents(UnkNown Source)
        at java.awt.EventdispatchThread.pumpEvents(UnkNown Source)
        at java.awt.EventdispatchThread.run(UnkNown Source)

mydatabase类的一部分：

public class SmDatabase {

    Connection conn = null;

    public SmDatabase() {
        try {
            String drivername = \"oracle.jdbc.driver.OracleDriver\";
            Class.forName(drivername);

            String ServerName = \"127.0.0.1\";
            String ProtNumber = \"1521\";
            //String sid = \"DEVP0\";
            String sid = \"cms\";

            String url =
                \"jdbc:oracle:thin:@\" + ServerName + \":\" + ProtNumber + \":\" +
                sid;

            //String Username = \"PENTAVCB\";
            //String Password = \"pentasoft123\";
            String Username = \"cmsuser\";
            String Password = \"pass\";

            conn = DriverManager.getConnection(url,Username,Password);
        } catch (ClassNotFoundException e) {
            System.out.print(e.getStackTrace());
        } catch (sqlException se) {
            System.out.print(se.getStackTrace());
        }
    }

public Vector<String[]> selectCustomers(String command) {
    ResultSet resultSet = null;
    Statement statement;
    Vector<String[]> customerName = new Vector<String[]>();
    try {
        statement = conn.createStatement();
LINE151     resultSet = statement.executeQuery(command);

        while (resultSet.next()) {
            String[] temp = new String[2];
            temp[0] = resultSet.getString(\"V_CUST_NAME\");
            temp[1] = resultSet.getString(\"V_CUST_CODE\");
            customerName.add(temp);
        }
        resultSet.close();
        statement.close();
        //    conn.close();
    } catch (sqlException e) {
        System.out.println(e.getStackTrace());
    }
    return customerName;
}

解决方法

e.printStackTrace();

将比produce5ѭ产生更多有用的输出。我会更改它在您的应用程序中出现的所有位置，然后重试。

DriverManager.getConnection(url,Username,Password);

很可能会引发您无法正确打印的异常，从而产生\“ [Ljava.lang.StackTraceElement ... \”垃圾。,输出在第151行指示空指针异常，该异常应指示\“ statement \”变量为空。 \“ conn \”不为null，否则将在前一行引发异常。奇怪的是，如果您具有有效的连接，则应该能够获得一条声明。行号是否可能偏离1？您可以将代码更改为：

   if conn is null  System.out.println(\"conn is null!!!\");
   else System.out.println(\"conn is set\");

   statement = conn.createStatement();   

   if statement is null  System.out.println(\"statement is null!!!\");
   else System.out.println(\"statement is set\");

   resultSet = statement.executeQuery(command);

   if resultSet is null  System.out.println(\"resultSet is null!!!\");
   else System.out.println(\"resultSet is set\");

我看不到在哪里调用SmDatabase来设置conn。是从别的地方叫吗？呼叫是否捕获异常并且不显示错误消息？,你有什么例外？如果它是ClassNotFoundException，则只需在命令中添加8。 Oracle客户端jar也可以放在传递给ѭ10的ѭ9争论的末尾。,我通过使用以下命令解决了我的问题：

java -client -classpath ojdbc14.jar;lipstikLF-1.1.jar;swing-layout.jar;smt.jar Main.GUI.SmRun rimrim

我想我们在项目中使用的那些库也需要运行，但是我不确定，我只是建议这项工作

java -client -classpath <name of you library>;<name of you library>;<name of your jar file> nameOfPackage.nameOfRunClass parameter[if any]

如果有人在此帖子中添加一些有用的信息，我将非常感谢