Can't add custom folder into source path

[weiker]

I hava some java file generated by maven thrfit plugin in target/generated-sources/thrift , these file haven't been add into java source path ,but strangly target/generated-sources/protobuf/java created by maven protobuf plugin was added .
I tried manualy add the path target/generated-sources/thrift by click the option "Add Folder to Java Source Path" in right-click menu ,it shows :

So I tried use build-helper-maven-plugin config like this:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.8</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>src/java/main</source>
<source>src/java/generated-sources</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
but it's still not work .
How can I add generated-sources folder into Java source path?

[jdneo]

Please see: redhat-developer/vscode-java#177 (comment)

[no-response]

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