I am working on custom Sling Filter in AEM 6.2 SP1. I am running in to issue where i am getting runtime whenever i upload my project JAR for one service.
The error is :
Error during instantiation of the implementation object (java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest)
at java.lang.Class.getDeclaredConstructors0(Native Method)
Caused by: java.lang.ClassNotFoundException: javax.servlet.http.HttpServletRequest not found by com.*.*.core 
I do not have any issues while compiling the project. It complies with out a problem. I am having javax.servlet as a dependency in POM. I tried with different versions of that also. I am running in to this issue every time i install jar in publish or author instance.
Any ideas or help would be appreciated.
You have to ensure that the dependency javax.servlet.http.httpservletrequest is available in AEM. For this, go to /system/console/depfinder and search for javax.servlet.http.httpservletrequest and see which bundle exports it. You can then update you dependency accordingly and try re-uploading your jar.
I think you tried wrong Jar file in depfinder. It should be javax.servlet.http.HttpServletRequest and you are looking for javax.servlet.http.httpservletrequest.
I have tried to add the dependency also but it did not worked.
You need to get a physical JAR file that contains this Java package, wrap that JAR into an OSGi bundle and then deploy that OSGi bundle to AEM. It has nothing to do with adding a dependency to the POM when you build the bundle. THe issue is this Java package is not in the AEM OSGi service container. That is, no OSGi bundle exposes that Java package.
Is your jar file an OSGi bundle?
If so what do you have defined as the Bundle-SymbolicName? You can get the Bundle-SymbolicName from the META-INF/MANIFEST.MF file in the jar file.
The reason I ask is because com.*.*.core is weird in this error message:
Caused by: java.lang.ClassNotFoundException: javax.servlet.http.HttpServletRequest not found by com.*.*.core