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DUPLICATE_ELEMENT
Googler edited this page Aug 13, 2020
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1 revision
Guice will throw a ProvisionException
with DUPLICATE_ELEMENT
error if:
- Duplicate values are added to a Multibinder that does not allow duplicates
- Duplicate keys are added to a MapBinder that does not allow duplicates
If the Multibinder
or MapBinder
should not have duplicate elements then this
error can be fixed by modifying the application code to prevent duplicate
elements from being added. The error message from Guice contains information on
what the duplicate values or keys are.
If it is expected that the Multibinder
or MapBinder
will have duplicates
values or keys, make sure that permitDuplicates
is called when the
Multibinder
or MapBinder
is created:
final class FooModule extends AbstractModule {
@Override
protected void configure() {
Multibinder.newSetBinder(binder(), String.class)
.permitDuplicates();
MapBinder.newMapBinder(binder(), String.class, String.class)
.permitDuplicates();
}
}
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