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！但是当我使用我的JDeveloper IDE时，没有问题！ 我的IDE运行此命令：
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
我使用这个命令：
Java -jar smt.jar amir
当我运行IDE命令时没有问题，一切正常，请你帮我吗？ （我的程序正在运行＆amp; working我无法从数据库中获取数据）
当我尝试从我的数据库中选择时，我收到以下错误...
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;
}
答案 0 :(得分：0)
你有什么例外？如果它是ClassNotFoundException，那么您只需要在命令中添加-cp oracleclient.jar。
Oracle客户端jar也可以放在传递给-classpath的{{1}}争论的末尾。
答案 1 :(得分：0)
e.printStackTrace();将产生比System.out.println(e.getStackTrace());更有用的输出。我会改变它在你的应用程序中出现的任何地方，然后再试一次。 DriverManager.getConnection(url, Username, Password);很可能抛出一个你没有正确打印的异常，这会产生“[Ljava.lang.StackTraceElement ...”垃圾。
答案 2 :(得分：0)
输出指示第151行的空指针异常，它应指示“statement”变量为null。 “conn”不为null，或者在前一行抛出异常。这很奇怪，如果你有一个有效的连接，你应该能得到一个Statement。行号是否可能被1关闭？您能否将代码更改为：
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");
我没有看到调用SmDatabase的位置来设置conn。它是从其他地方调用的吗？调用是否捕获异常并且不打印错误消息？
答案 3 :(得分：0)
我使用此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]
如果有人在这篇文章中添加一些有用的信息，我将非常感激