Beim Speichern eines Angebots kommt folgender Fehler. Der Zähler mit der Angebotsnummer wird hochgesetzt, aber das Angebot nicht gespeichert:

WARNING: Extender - Refreshing disabled - entities in bundle com.sebulli.fakturama.model may not be woven
[Server@559af296]: Initiating startup sequence...
[Server@559af296]: Server socket opened successfully in 3 ms.
[Server@559af296]: Database [index=0, id=0, db=file:/home/klaus/Office/Fakturama/Database/Database, alias=fakdbneu] opened successfully in 337 ms.
[Server@559af296]: Startup sequence completed in 341 ms.
[Server@559af296]: 2019-11-14 12:05:44.268 HSQLDB server 2.4.1 is online on port 9002
[Server@559af296]: To close normally, connect and execute SHUTDOWN SQL
[Server@559af296]: From command line, use [Ctrl]+[C] to abort abruptly
[EL Info]: 2019-11-14 12:05:46.357--ServerSession(1916370416)--EclipseLink, version: Eclipse Persistence Services - 2.7.3.v20180807-4be1041
[EL Info]: connection: 2019-11-14 12:05:46.697--ServerSession(1916370416)--/unconfigured2_nonJtaDataSource=1221508716_url=jdbc:hsqldb:hsql://localhost:9002/fakdbneu_user=sa login successful
12:05:56.512 [Equinox Log Thread - Equinox Container: 547abf0b-9572-4e77-9127-eda23a35177c] ERROR com.sebulli.fakturama.common - Failed to persist contents of part (com.sebulli.fakturama.editors.documentEditor)
org.eclipse.e4.core.di.InjectionException: java.lang.NullPointerException
	at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:68) ~[na:na]
...

~$ java -version
openjdk version "1.8.0_232"
OpenJDK Runtime Environment (build 1.8.0_232-8u232-b09-1~deb9u1-b09)
OpenJDK 64-Bit Server VM (build 25.232-b09, mixed mode)
~$ cat /etc/debian_version
9.11