无法将MS SQL Server 2008与Java连接

Question

I tried to connect java with My MS SQL express, I downloaded the sqljdbc4.jar also

When I don't bother with the CLASSPATH and all and I try to execute my program( even with sqljdbc in

C:\\Program Files (x86)\\Java\\jre6\\lib

I get the following error

java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver.SQLServerDriver
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:169)
    at Connect.getConnection(Connect.java:24)
    at Connect.displayDbProperties(Connect.java:42)
    at Connect.main(Connect.java:78)

Error Trace in getConnection() : com.microsoft.jdbc.sqlserver.SQLServerDriver Error: No active Connection

But If I try and set the CLASSPATH variable to point to sqljdbc4.jar then ClassNotHoundExcepetion is occurring with identifying my classname.

Need immediate help. kindly respond.

I use Command line mode of invoking it, I tried setting the classpath in the system variables dialog box of windows 7. and when I do that or use set CLASSPATH="C:\\temp\\sqljdbc4.jar" the jre fails to recogonize the main class of my program and throws

Exception in thread "main" java.lang.NoClassDefFoundError: Connect
Caused by: java.lang.ClassNotFoundException: Connect
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)

Could not find the main class: Connect. Program will exit.

So I am at a loss here.

Answer 1

Your problem occur because classloader has not found driver jar, how you start your program? Have you put -cp or -classpath if it command line ? Or add to lib folder if web application ?

Answer 2

You should set the classpath to include the sqljdbc4.jar file. See details here .