Error saving file: java.lang.NullPointerException

[diethardsteiner]

Environment:
Fedora 20
PDI v5.0.1-stable
java version "1.7.0_45"
"Get JDBC Metadata" step plugin downloaded from marketplace

Error:
When adding the Get JDBC Metadata step and then saving the transformation, I get following error message:
Error saving file: java.lang.NullPointerException

Removing the step and then saving the file works.

This is what it shows in the Error details window:
java.lang.NullPointerException
at org.pentaho.di.steps.jdbcmetadata.JdbcMetaDataMeta.getXML(JdbcMetaDataMeta.java:787)
at org.pentaho.di.trans.step.StepMeta.getXML(StepMeta.java:210)
at org.pentaho.di.trans.step.StepMeta.getXML(StepMeta.java:189)
at org.pentaho.di.trans.TransMeta.getXML(TransMeta.java:2650)
at org.pentaho.di.trans.TransMeta.getXML(TransMeta.java:2476)
at org.pentaho.di.ui.spoon.Spoon.saveMeta(Spoon.java:5419)
at org.pentaho.di.ui.spoon.TransFileListener.save(TransFileListener.java:99)
at org.pentaho.di.ui.spoon.Spoon.save(Spoon.java:5404)
at org.pentaho.di.ui.spoon.Spoon.saveToFile(Spoon.java:4652)
at org.pentaho.di.ui.spoon.Spoon.saveFile(Spoon.java:4610)
at sun.reflect.GeneratedMethodAccessor44.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.pentaho.ui.xul.impl.AbstractXulDomContainer.invoke(AbstractXulDomContainer.java:329)
at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:139)
at org.pentaho.ui.xul.impl.AbstractXulComponent.invoke(AbstractXulComponent.java:123)
at org.pentaho.ui.xul.jface.tags.JfaceMenuitem.access$100(JfaceMenuitem.java:26)
at org.pentaho.ui.xul.jface.tags.JfaceMenuitem$1.run(JfaceMenuitem.java:88)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:545)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:490)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:402)
at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source)
at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source)
at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1227)
at org.pentaho.di.ui.spoon.Spoon.waitForDispose(Spoon.java:7368)
at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:8673)
at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:625)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.pentaho.commons.launcher.Launcher.main(Launcher.java:134)

[diethardsteiner]

I reinstalled the plugin now using the files from github and this error does not occur any more. However, I'd like to point out the following:

Installing the plugin from the marketplace creates following folders:
plugins/steps/jdbcMetaData
plugins/steps/pentaho-pdi-plugin-jdbc-metadata

Uninstalling the plugin from the marketplace tries to remove plugins/steps/jdbcMetaData only

For some unknown reason both install and uninstall processes are in "Operation in progress ... " mode indefinitely.
I don't know if this is something to do with the marketplace or with this plugin, but it should be checked. Files are downloaded and removed, so something is happening.