Static Imports and IntelliJ

Hi,

I am currently trying to generate a static import statement to a newly generated Java class. What I got are references to PsiElements. How can I convert those to static import statements?

Whenever I try to call

AddSingleMemberStaticImportAction.invoke(erzeugerClazz.getContainingFile(), psiElement)

I get a ClassCastException:
java.lang.ClassCastException: com.intellij.psi.impl.source.PsiJavaFileImpl cannot be cast to com.intellij.psi.PsiJavaCodeReferenceElement

When I try to call

PsiClass clazz = AddOnDemandStaticImportAction.getClassToPerformStaticImport(psiElement);
if (clazz != null) {
  AddOnDemandStaticImportAction.invoke(project, erzeugerClazz.getContainingFile(), fileEditorManager.getSelectedTextEditor(), clazz);
}

clazz is null.

Obviously I am doing something wrong. But how can I add static imports to a PsiClass? Where can I find some kind of example on how to add those imports?

Thanks, Matthias