@Suggestable and @Proposable throw NullPointerExceptions

Schrauber — Fri, 02 Jan 2026 14:45:42 GMT

Hi,

I am working on a custom component developed with talend component kit.

In my UI, I have one field with selection. I tried @Suggestable and also @Proposable to achieve this.

This seems to be working. I get my selection list an I can select one entry. But with both methods I find NullPointerExceptions in the .log file in my studio workspace.

What is wrong here?

My Studio is Open Studio 7.3.1

The version of talend component kit from studio is 1.1.15 and I have set the version in pom also to 1.1.15.

I implemented @Suggestable as follows:

@Option

@Required

@Suggestable(GET_PATH_LIST)

@Documentation("TODO fill the documentation for this parameter")

private String path;

And in @Service:

public static final String GET_PATH_LIST = "getPathList";

@Suggestions(GET_PATH_LIST)

public SuggestionValues getPathList() {

List<SuggestionValues.Item> items = new ArrayList<>();

items.add(new SuggestionValues.Item("/api/rest/v1/locales", "/api/rest/v1/locales"));

items.add(new SuggestionValues.Item("/api/rest/v1/channels", "/api/rest/v1/channels"));

items.add(new SuggestionValues.Item("/api/rest/v1/currencies", "/api/rest/v1/currencies"));

items.add(new SuggestionValues.Item("/api/rest/v1/attributes", "/api/rest/v1/attributes"));

items.add(new SuggestionValues.Item("/api/rest/v1/attributes/{attributeCode}/options", "/api/rest/v1/attributes/{attributeCode}/options"));

items.add(new SuggestionValues.Item("/api/rest/v1/attribute-groups", "/api/rest/v1/attribute-groups"));

items.add(new SuggestionValues.Item("/api/rest/v1/families", "/api/rest/v1/families"));

items.add(new SuggestionValues.Item("/api/rest/v1/products", "/api/rest/v1/products"));

return new SuggestionValues(true, items);

}

What I have read from the docs, this should be OK.

But now I get this NullPointerException:

!ENTRY org.talend.platform.logging 2 0 2020-11-21 21:36:18.616

!MESSAGE 2020-11-21 21:36:18,615 WARN org.talend.sdk.component.studio.logging.JULToOsgiHandler - [org.talend.sdk.component.server.configuration.WebSocketBroadcastSetup$JAXRSEndpoint.onError] Error for session 0

!STACK 0

java.lang.NullPointerException

at org.talend.sdk.component.server.front.memory.AsyncContextImpl.complete(AsyncContextImpl.java:156)

at org.apache.cxf.transport.http.Servlet3ContinuationProvider$Servlet3Continuation.reset(Servlet3ContinuationProvider.java:158)

at org.apache.cxf.transport.http.Servlet3ContinuationProvider.complete(Servlet3ContinuationProvider.java:71)

at org.apache.cxf.transport.http.AbstractHTTPDestination.invokeComplete(AbstractHTTPDestination.java:295)

at org.apache.cxf.transport.http.AbstractHTTPDestination.invoke(AbstractHTTPDestination.java:268)

at org.talend.sdk.component.server.configuration.WebSocketBroadcastSetup$WebSocketDestination.invoke(WebSocketBroadcastSetup.java:516)

at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:234)

at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:208)

at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:160)

at org.talend.sdk.component.server.configuration.WebSocketBroadcastSetup$JAXRSEndpoint.lambda$onOpen$4(WebSocketBroadcastSetup.java:292)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.apache.tomcat.websocket.pojo.PojoMessageHandlerWholeBase.onMessage(PojoMessageHandlerWholeBase.java:80)

at org.apache.tomcat.websocket.WsFrameBase.sendMessageBinary(WsFrameBase.java:582)

at org.apache.tomcat.websocket.server.WsFrameServer.sendMessageBinary(WsFrameServer.java:131)

at org.apache.tomcat.websocket.WsFrameBase.processDataBinary(WsFrameBase.java:541)

at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:300)

at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:133)

at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:82)

at org.apache.tomcat.websocket.server.WsFrameServer.doOnDataAvailable(WsFrameServer.java:171)

at org.apache.tomcat.websocket.server.WsFrameServer.notifyDataAvailable(WsFrameServer.java:151)

at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler.upgradeDispatch(WsHttpUpgradeHandler.java:148)

at org.apache.coyote.http11.upgrade.UpgradeProcessorInternal.dispatch(UpgradeProcessorInternal.java:54)

at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:53)

at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1579)

at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:748)

Any Ideas on that?

Best regards,

Schrauber

Re: @Suggestable and @Proposable throw NullPointerExceptions

ozhelezniak — Thu, 11 Feb 2021 09:37:00 GMT

Hi @Maik Opitz

I suggest using @Proposable and dynamic values https://talend.github.io/component-runtime/main/1.28.2/ref-actions.html#_dynamic_values

for your example.

What did you mean when you said: "But with both method". I see only one method that marked with "@Suggestions(GET_PATH_LIST)".

Re: @Suggestable and @Proposable throw NullPointerExceptions

undx — Thu, 11 Feb 2021 11:22:57 GMT

Hi @Maik Opitz ,

Everything seems fine in your code...

Can you reproduce with the `talend-component:web` goal ?

Also, in studio `configuration/config.ini` put the following property

```

component.java.port=8181

```

restart your studio and do the following curl call

```

curl -X POST "localhost:8181/api/v1/action/execute?family=YourFamilyName&type=suggestions&action=getPathList&language=en" -H "accept: application/json" -H "Content-Type: application/json" -d '{}'

```

Do you get ?

```

{"cacheable":true,"items":[{"id":"/api/rest/v1/locales","label":"/api/rest/v1/locales"},{"id":"/api/rest/v1/channels","label":"/api/rest/v1/channels"},{"id":"/api/rest/v1/currencies","label":"/api/rest/v1/currencies"},{"id":"/api/rest/v1/attributes","label":"/api/rest/v1/attributes"},{"id":"/api/rest/v1/attributes/{attributeCode}/options","label":"/api/rest/v1/attributes/{attributeCode}/options"},{"id":"/api/rest/v1/attribute-groups","label":"/api/rest/v1/attribute-groups"},{"id":"/api/rest/v1/families","label":"/api/rest/v1/families"},{"id":"/api/rest/v1/products","label":"/api/rest/v1/products"}]}

```

Otherwise post the result and st.

thanks

topic Re: @Suggestable and @Proposable throw NullPointerExceptions in Talend Studio

@Suggestable and @Proposable throw NullPointerExceptions

Re: @Suggestable and @Proposable throw NullPointerExceptions

Re: @Suggestable and @Proposable throw NullPointerExceptions