classloader question - same classes in 2 different jar files

[go77306]

Hi, i have a question about classloader:

I have few classes, for some reason, I have to put these classes in 2 different jar files, and both jar file will be in my class path. Will this cause any classloader problem? or any other problems?

e.g.:

I have
a.class, b.class, c.class.....z.class

I have to put above to both 1.jar and 2.jar

My class path is C:\lib\1.jar;c:\2.jar;c:\3.jar....

Will this cause any problems?

Thanks !!!

[Goodz13]

Is the package the same?

If not than the only thing that you will have to do is, provide the fully qualified package name when declaring variables. ie

ResultSet myResultSet = myStatement.executeQuery("SELECT * FROM SomeTable");

java.util.Date utilDate = new java.util.Date();

java.sql.Date sqlDate = myResultSet.getDate(1);

Notice that the package is specified (java.util and java.sql)

If the packages are the same, than you will run into problems

[go77306]

Yes, packages are the same.... what kind of problem I will run into?

Thanks.

[Goodz13]

I don't think that you will actually get errors, but the VM (Virtual Machine) will pick up the class it finds in the classpath first.

ie if your classpath is something like:

Test1.jar;Test2.jar

Where Test1.jar has the same classes and packages as Test2.jar, the VM will pick to the classes in Test1.jar and not Test2.jar.

I could be rong, I never tried it.

[go77306]

Yes, this is what I thought

[cjard]

i'd love to know why you need to put identical classes in 2 different jar files, and use both jars in your app. it sounds like your filesystem structuring could do with some re-thinking