Matthias,

Given it's this method:

public void setLineDelimiter(String lineDelimiter)
{
// Avoid cycles
//
if (this.lineDelimiter != lineDelimiter)
{
this.lineDelimiter = lineDelimiter;
if (importManager != null)
{
importManager.setLineDelimiter(lineDelimiter);
}

// We also need to set it on any GenModels holding any used or
static packages that may be refered to.
//
for (GenPackage genPackage : getUsedGenPackages())
{
genPackage.getGenModel().setLineDelimiter(lineDelimiter);
}

for (GenPackage genPackage : getStaticGenPackages())
{
genPackage.getGenModel().setLineDelimiter(lineDelimiter);
}

// There was previously code intended to set it on the cached
GenModels holding the special Ecore and XML packages,
// but it erroneously set the import manager. So, it seems that
was not necessary.
}
}

The only place I can see that would throw a null pointer exception in
this method would be one of the getGenModel() calls returning null.
Most likely some usedGenPackage is failing to resolve. Perhaps that's
exactly what you did, i.e., add a reference to another Ecore model for
which you've not associated the used GenPackage. I assume you're able to
open this *.genmodel with the "EMF Generator" editor? Does Generator
-> Reload... work in this scenario? That should allow you to repair a
broken reference to another GenModel.


On 18.05.2016 14:20, Matthias Austruy wrote:
>
> java.lang.NullPointerException
> at
> org.eclipse.emf.codegen.ecore.genmodel.impl.GenModelImpl.setLineDelimiter(GenModelImpl.java:2380)
> at
> org.eclipse.emf.codegen.ecore.genmodel.impl.GenModelImpl.setLineDelimiter(GenModelImpl.java:2380)
> at
> org.eclipse.emf.codegen.ecore.genmodel.generator.GenBaseGeneratorAdapter.setLineDelimiter(GenBaseGeneratorAdapter.java:331)
> at
> org.eclipse.emf.codegen.ecore.generator.AbstractGeneratorAdapter.generateProperties(AbstractGeneratorAdapter.java:1769)
> at
> org.eclipse.emf.codegen.ecore.genmodel.generator.GenModelGeneratorAdapter.generateModelPluginProperties(GenModelGeneratorAdapter.java:257)
> at
> org.eclipse.emf.codegen.ecore.genmodel.generator.GenModelGeneratorAdapter.generateModel(GenModelGeneratorAdapter.java:153)
> at
> org.eclipse.emf.codegen.ecore.genmodel.generator.GenBaseGeneratorAdapter.doGenerate(GenBaseGeneratorAdapter.java:215)
> at
> org.eclipse.emf.codegen.ecore.generator.AbstractGeneratorAdapter.generate(AbstractGeneratorAdapter.java:317)