getResourceAsStream fails under new environment?

Hallo,

i have following line of code:

InputStream passoloExportFileInputStream = getClass().getClassLoader().getResourceAsStream("/com/thinkplexx/lang/de/general.xml");

and i know that jar with com/thinkplexx/lang/de/general.xml is in classpath.

It worked under "previous environment", which is maven2 build.

Now, i evaluate maven3 and it doesn't work! I know, that if i change the code to be:

InputStream passoloExportFileInputStream = getClass().getClassLoader().getResourceAsStream("com/thinkplexx/lang/de/general.xml");

it works great (i just removed the first slash from the resource path).

Btw, i use Linux. First slash in path normally means "from the root directory"开发者_开发技巧, so if this logic is sound for java resource loading as well, first example should never have worked!?

Questions: is something wrong with the first code sample, i.e. with /com/ and not com/? Is it just bad code or it means something different?

thank you!

It depends on how you are getting the resource. When you use a ClassLoader as in:

InputStream stream= getClass().getClassLoader().getResourceAsStream("/com/thinkplexx/lang/de/general.xml");

The leading '/' is meaningless. So, the correct form is "com/thinkplexx/lang/de/general.xml".

If, instead you use a 'Class', as in:

InputStream stream= getClass().getResourceAsStream("/com/thinkplexx/lang/de/general.xml");

You get a different behavior. The Class.getResourceAsStream will consider classes without a leading '.' to be relative to the package containing the class. Resources specified with a leading '.' are absolute, or resolved relative to the root of the jar.

So, if this is a reference to com.example.SomeThing, then the expected behavior is:

getClass().getResourceAsStream("/a/b/c.xml")  ==> a/b/c.xml
getClass().getResourceAsStream("a/b/c.xml")  ==> com/example/a/b/c.xml
getClass().getClassLoader().getResourceAsStream("a/b/c.xml")  ==> a/b/c.xml
getClass().getClassLoader().getResourceAsStream("/a/b/c.xml")  ==> Incorrect

Maven2 was being lax and allowing the last form.