Message13048

the issue https://bugs.jython.org/issue2472 and its subsequent resolution bc317e2 causes a side effect where jython will attempt to find a relative import again and again despite having done so in the past.

This violates expected python 2.7 relative import optimisation that places a None whenever an import is not found as opposed to null.

Consider the case of a local import being done on a loop without the use of absolute imports, we will attempt to generate all java classes, org.python.core.JavaImportHelper.tryAddPackage(), org.python.core.JavaImportHelper.buildLoadedPackages(), and java.lang.Package.getPackages() which add up to tons of CPU time usage.