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Problems and error messages with the IDE
Troubleshooting for Nuclos development – fix compiler, server, client and runtime errors.
REFERENZ DEVELOPER STAND: JUL 2026 GILT FUER NUCLOS 4.2026.X
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Common errors during Nuclos development in the IDE and how to fix them.
When compiling
| Error | Fix |
|---|---|
ajc: The import org.nuclos.schema.* cannot be resolved | nuclos-schema → Maven → Generate Sources and Update Folders. |
ajc: * cannot be resolved to a type | nuclos → Maven → Reimport. |
When starting the server
BeanCreationException … A universal match pattern ('/**') is defined before other patterns …: run mvn clean in the terminal.
war as a module
For mvn clean to take effect, the war must be listed as a module in the pom.xml. This is given for the Nuclos core; for extension projects you may need to add it.
When starting the client
Error creating bean 'internalAspectJWeavingEnabler' … (form freezes after login): place the spring-instrument-*.jar somewhere and reference it in the client configuration under VM arguments.
Runtime
Unexpected NullPointerException (e.g. on @Autowired fields): Nuclos needs the AspectJ compiler. Make sure Ajc is active in the Maven import.
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