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Testing with Database connections - help needed

 
Betsy Camel
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Hi all,

I have a application with struts framework which has a DAO class, a bussiness object class. i am using strutstestcase for testing the struts app. but when it gets connected to the DAO(which has lots of session objects getting connected to the DB), the tests donot run. It gives a nullpointerexception. i guess this should be a in-container testing. can anyone give me an idea of which would be the best tool for testing this type of application. Please reply soon.
 
Jeanne Boyarsky
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Betsy,
You have a few choices:
1) Unit tests the DAOs/business object class independently via pure JUnit.
2) Use a tool like StrutsTestCase or Cactus to run your Struts actions in container.
3) Use a tool like HTMLUnit to test your URLs without a browser.
4) Use a tool like Selenium to test your URLs through a browser.
 
Betsy Camel
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Hi jeanne,

your first point - test the dao's via pure junit requires clarification as the dao class has a lot of session objects which require servletcontext. can this scenario be tested via pure junit? i have tried still i get the same error. can you please help me in understanding how to test this scenario.
 
Jeanne Boyarsky
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Betsy,
You could mock out the servlet context or refactor your code to reduce the dependencies on the context. In the long run, the later is useful as makes your code more testable and maintainable.
 
Betsy Camel
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hi
i am getting the following error while testing database connections.

junit.framework.AssertionFailedError: Exception in constructor: testhasOAVRole (java.lang.NullPointerException
at com.gm.bpd.common.transaction.Session.connect(Session.java:69)
at com.gm.bpd.common.transaction.Session.<init>(Session.java:35)
at com.gm.bpd.admin.dao.testACLCUDDAO.<init>(testACLCUDDAO.java:15)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at junit.framework.TestSuite.createTest(TestSuite.java:131)
at junit.framework.TestSuite.addTestMethod(TestSuite.java:114)
at junit.framework.TestSuite.<init>(TestSuite.java:75)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.getTest(RemoteTestRunner.java:399)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:445)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
)
at junit.framework.Assert.fail(Assert.java:47)
at junit.framework.TestSuite$1.runTest(TestSuite.java:263)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:478)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:344)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)


please find the class below.





Please help me resolve ASAP

[edited to add code tags]
[ April 16, 2008: Message edited by: Jeanne Boyarsky ]
 
Jeanne Boyarsky
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I think the problem is in this code. Does it print an error message?

You really should throw an exception, not just print the exception out. This way, it won't fail later with a null pointer. (Also the nested try/catch blocks don't do anything. You only need one level.)

 
Betsy Camel
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YEs i am getting a connectException. what does this mean ?
 
Lasse Koskela
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It means your code is trying to connect to a database but fails in doing that. Is there a database? Do you intend to connect to an actual database? What does the ConnectionException say?
 
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