[Question] How to enable annotation processing

[mbauhardt]

background
I want to emacs-lsp/lsp-java to compile/build a gradle based java project which uses annotation processing to generate source code.
I found https://github.com/emacs-lsp/lsp-java/blob/master/lsp-java.el#L1768 which let me hope that this feature is possible.

Steps to reproduce
So I updated my doom emacs lsp-java config to revision e78199d
and tried to build a small demo project https://github.com/mbauhardt/ecj-filer-exception without success
Because I'm new into emacs I'm pretty sure I do something wrong.

Final Question
Can someone help me and give me some hints how to enable my emacs config to support annotation processing to generate code?

thx.
marko

[ldeck]

@yyoncho I'm also trying to figure out how to enable annotation processing but with a maven based project.

I have a multi-module project, but have added a workspace folder for the module I'd like to work on in isolation.

When running lsp-java-build-project I see in the *lsp-logs* buffer errors indicating that annotation processing hasn't been considered.

e.g., for every spring component annotated with Lombok's @RequiredArgsConstructor coupled with a set of private final FooBarWiring foobarWiring I see in the lsp logs an entry like:

message: The blank final field foobarWiring may not have been initialized; code: 33554513; resource: /path/to/Component.java; line: 20

I can see the below files after for example running lsp-java-update-project-configurations and am unsure what configuration is missing? The build succeeds (with annotation processing occurring as intended) via maven, but not from lsp. There doesn't appear to be a configuration for lsp that would provide args to javac (if that's used) for the processor paths. Not sure if the jdt server has its own configuration that's required.

The configurations that appear relevant...

.factorypath

<factorypath>
    <factorypathentry kind="VARJAR" id="M2_REPO/org/projectlombok/lombok/1.18.34/lombok-1.18.34.jar" enabled="true" runInBatchMode="false"/>
    <factorypathentry kind="VARJAR" id="M2_REPO/org/mapstruct/mapstruct-processor/1.6.3/mapstruct-processor-1.6.3.jar" enabled="true" runInBatchMode="false"/>
</factorypath>

.project

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
        <name>origin-sector-service</name>
        <comment></comment>
        <projects>
        </projects>
        <buildSpec>
                <buildCommand>
                        <name>org.eclipse.jdt.core.javabuilder</name>
                        <arguments>
                        </arguments>
                </buildCommand>
                <buildCommand>
                        <name>org.eclipse.m2e.core.maven2Builder</name>
                        <arguments>
                        </arguments>
                </buildCommand>
        </buildSpec>
        <natures>
                <nature>org.eclipse.jdt.core.javanature</nature>
                <nature>org.eclipse.m2e.core.maven2Nature</nature>
        </natures>
        <filteredResources>
                <filter>
                        <id>1717628456476</id>
                        <name></name>
                        <type>30</type>
                        <matcher>
                                <id>org.eclipse.core.resources.regexFilterMatcher</id>
                                <arguments>node_modules|.metadata|archetype-resources|META-INF/maven|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
                        </matcher>
                </filter>
        </filteredResources>
</projectDescription>

.settings/org.eclipse.jdt.core.prefs

eclipse.preferences.version=1
org.eclipse.jdt.core.compiler.codegen.methodParameters=generate
org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
org.eclipse.jdt.core.compiler.compliance=17
org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore
org.eclipse.jdt.core.compiler.processAnnotations=enabled
org.eclipse.jdt.core.compiler.release=enabled
org.eclipse.jdt.core.compiler.source=17

.classpath

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
        <classpathentry kind="src" output="target/classes" path="src/main/java">
                <attributes>
                        <attribute name="optional" value="true"/>
                        <attribute name="maven.pomderived" value="true"/>
                </attributes>
        </classpathentry>
        <classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
                <attributes>
                        <attribute name="maven.pomderived" value="true"/>
                        <attribute name="optional" value="true"/>
                </attributes>
        </classpathentry>
        <classpathentry kind="src" output="target/test-classes" path="src/test/java">
                <attributes>
                        <attribute name="optional" value="true"/>
                        <attribute name="maven.pomderived" value="true"/>
                        <attribute name="test" value="true"/>
                </attributes>
        </classpathentry>
        <classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
                <attributes>
                        <attribute name="maven.pomderived" value="true"/>
                        <attribute name="test" value="true"/>
                        <attribute name="optional" value="true"/>
                </attributes>
        </classpathentry>
        <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17">
                <attributes>
                        <attribute name="maven.pomderived" value="true"/>
                </attributes>
        </classpathentry>
        <classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
                <attributes>
                        <attribute name="maven.pomderived" value="true"/>
                </attributes>
        </classpathentry>
        <classpathentry kind="src" path="target/generated-sources/annotations">
                <attributes>
                        <attribute name="optional" value="true"/>
                        <attribute name="maven.pomderived" value="true"/>
                        <attribute name="ignore_optional_problems" value="true"/>
                        <attribute name="m2e-apt" value="true"/>
                </attributes>
        </classpathentry>
        <classpathentry kind="src" output="target/test-classes" path="target/generated-test-sources/test-annotations">
                <attributes>
                        <attribute name="optional" value="true"/>
                        <attribute name="maven.pomderived" value="true"/>
                        <attribute name="ignore_optional_problems" value="true"/>
                        <attribute name="m2e-apt" value="true"/>
                        <attribute name="test" value="true"/>
                </attributes>
        </classpathentry>
        <classpathentry kind="output" path="target/classes"/>
</classpath>

[ldeck]

See #472