eclipse.jdt.ls build fails due to breaking changes in LSP4J

[snjeza]

See https://ci.eclipse.org/ls/job/jdt-ls-master/807/console

The error is caused by changes in lsp4j API:

• Parameter of textDocument/signatureHelp changed from TextDocumentPositionParams position to SignatureHelpParams params

[woojoovove]

Hi, I encountered the same issue and It can be fixed by deleting "@OverRide" annotation of the method of

public CompletableFuture<SignatureHelp> signatureHelp(TextDocumentPositionParams position) {}

from

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/handlers/JDTLanguageServer.java

my error message

[INFO] ------------------------------------------------------------------------

[INFO] Reactor Summary for JDT Language Server :: Parent 0.50.0-SNAPSHOT:

[INFO]

[INFO] JDT Language Server :: Parent ...................... SUCCESS [ 0.306 s]

[INFO] JDT Language Server :: Target Platform ............. SUCCESS [ 1.014 s]

[INFO] JDT Language Server :: Core ........................ FAILURE [ 5.033 s]

[INFO] JDT Language Server :: Tests ....................... SKIPPED

[INFO] JDT Language Server :: Product ..................... SKIPPED

[INFO] ------------------------------------------------------------------------

[INFO] BUILD FAILURE

[INFO] ------------------------------------------------------------------------

[INFO] Total time: 42.869 s

[INFO] Finished at: 2020-01-31T20:01:00+09:00

[INFO] ------------------------------------------------------------------------

[ERROR] Failed to execute goal org.eclipse.tycho:tycho-compiler-plugin:1.6.0:compile (default-compile) on project org.eclipse.jdt.ls.core: Compilation failure: Compilation failure:

[ERROR] /home/XXX/XXX/eclipse-workspace/eclipse.jdt.ls/org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/handlers/JDTLanguageServer.java:[534]

[ERROR] public CompletableFuture signatureHelp(TextDocumentPositionParams position) {

[ERROR] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

[ERROR] The method signatureHelp(TextDocumentPositionParams) of type JDTLanguageServer must override or implement a supertype method

[ERROR] 1 problem (1 error)

[ERROR] -> [Help 1]

[ERROR]

[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.

[ERROR] Re-run Maven using the -X switch to enable full debug logging.

[ERROR]

[ERROR] For more information about the errors and possible solutions, please read the following articles:

[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

[ERROR]

[ERROR] After correcting the problems, you can resume the build with the command

[ERROR] mvn -rf :org.eclipse.jdt.ls.core