Powermock : MockClassLoader Issue with Log4j

When running a PowerMock Test Log4j gives me the following (or something similar) error:-

log4j:ERROR A "org.apache.log4j.xml.DOMConfigurator" object is not assignable to a "org.apache.log4j.spi.Configurator" variable.
log4j:ERROR The class "org.apache.log4j.spi.Configurator" was loaded by
log4j:ERROR [org.powermock.core.classloader.MockClassLoader@14a55f2] whereas object of type
log4j:ERROR "org.apache.log4j.xml.DOMConfigurator" was loaded by [sun.misc.Launcher$AppClassLoader@92e78c].
log4j:ERROR Could not instantiate configurator [org.apache.log4j.xml.DOMConfigurator].


Caused by: org.apache.commons.logging.LogConfigurationException:Invalid class loader hierarchy.  
You have more than one version of 'org.apache.commons.logging.Log' visible, which is not allowed.

There are a couple of different solutions to this:
# Upgrade to PowerMock 1.3+
# Make use of the @PowerMockIgnore annotation at the class-level of the test.
For example if using log4j, use `@PowerMockIgnore(“org.apache.log4j.*”)` if using commons logging, use `@PowerMockIgnore(“org.apache.commons.logging.*”)`.

Reference URL :-


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