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Regarding InputStream doubts..

 
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The following line throws null pointer exception while executing in RAD. Not sure about the reason. The XML file has present in the exact path and have access to the system.

InputStream is = Thread.currentThread().getContextClassLoader(). getResourceAsStream("c://services.xml");

Suggestions are welcome.
 
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"c://services.xml" is not a resource - it's a full path.

Resources are only for files located relative to your class / class loader. If you have the absolute path, use the following:
- new FileInputStream(...) if you need an InputStream
- new File(...).toURI().toURL() if you need a URL
 
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