unable to load class com.microsoft.sqlserver.jdbc.SQLServerDriver?

Question

I'm having an issue while trying to connect to an SQL Server 2008 database, here is the complete exception :

java.lang.UnsupportedClassVersionError: Bad version number in .class file (unable to load class com.microsoft.sqlserver.jdbc.SQLServerDriver)
    org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2531)
    org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1010)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1483)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1361)
    java.lang.ClassLoader.loadClassInternal(Unknown Source)
    java.lang.Class.forName0(Native Method)
    java.lang.Class.forName(Unknown Source)
    ma.ancfcc.dao.ConnexionSigest.getConnection(ConnexionSigest.java:120)
    ma.ancfcc.action.VerifyLoginAction.execute(VerifyLoginAction.java:70)
    org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
    org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
    org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
    org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
    org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
    org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
    org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
    org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

The exception is pointing to this line of code :

private static String DRIVER_SQLSERVER="com.microsoft.sqlserver.jdbc.SQLServerDriver";

How can I solve this ?

Because the line is a String variable declaration, which can't produce that stack trace. Lukelazarovic is right in his answer. If you claim that it won't work with java 1.7, you're wrong again. You're giving out bad information, so it's difficult to help you. — Kayaman
– Kayaman, Commented Jan 6, 2014 at 16:22
Kayman is right, exception on the row with String declaration is nonsense. As I look at the stacktrace, it's obvious that this is the line in your code, where exception occurs: ma.ancfcc.dao.ConnexionSigest.getConnection(ConnexionSigest.java:120) — lukelazarovic
– lukelazarovic, Commented Jan 6, 2014 at 16:57
sorry I was wrong @lukelazarovic, the line of code where exception occurs is here Class.forName(DRIVER_SQLSERVER); — mounaim
– mounaim, Commented Jan 7, 2014 at 9:00

Community · Accepted Answer · 2017-05-23 10:32:20Z

3

This exception is thrown when you try to load a class that was compiled with higher version of Java than the one you are running your application with.

See UnsupportedClassVersionError

check the version of JVM you run your app with using java -version
check the version of class file as suggested in how to check the jdk version used to compile a .class file - using javap -verbose com.microsoft.sqlserver.jdbc.SQLServerDriver
If jar is intended to use with higher version of Java, you can either:
- use higher version of JVM to run the app
- download older version of driver

edited May 23, 2017 at 10:32

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answered Jan 6, 2014 at 15:56

lukelazarovic

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2 Comments

mounaim Over a year ago

Thanks @lukelazarovic, I'm running jre6, how can I know which version of JVM my SQL SERVER driver is compatible with ?... with the logic of your answer, if I use jre 1.7 I should not have any problem, which is not true for me, I'm still getting the same exception with jre 1.7.

lukelazarovic Over a year ago

I have updated my answer - try to find out what version the class file is and update your question with this information.

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