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jdt.ls can't detect java core libraries in Gradle project #2900

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zefr0x opened this issue Oct 8, 2023 · 4 comments
Closed

jdt.ls can't detect java core libraries in Gradle project #2900

zefr0x opened this issue Oct 8, 2023 · 4 comments

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@zefr0x
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zefr0x commented Oct 8, 2023

When using Gradle and it's eclipse plugin. Gradle will generate a .classpath file for jdt.ls using this command:

$ gradle eclipse

When I open a java file in my IDE, it will detect (using .classpath) and provide auto completions for external dependencies. But it will not detect java's core libraries, and it will give me things like:

The type java.lang.Object cannot be resolved. It is indirectly referenced from required .class files

The import java.util cannot be resolved

Also when using the import keyword in java, it will not provide auto completions for any core java module, it will just list external ones specified in .classpath.

jdtls: 1.28.0
gradle: 8.3
OS: ArchLinux
IDE: NeoVim
@snjeza
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snjeza commented Oct 8, 2023

@zefr0x Could you show your .classpath and build.gradle?

@zefr0x
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zefr0x commented Oct 8, 2023 •
edited
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.classpath

<?xml version="1.0" encoding="UTF-8"?>
<classpath>
	<classpathentry kind="output" path="build/eclipse"/>
	<classpathentry output="build/eclipse/main" kind="src" path="src/main/java">
		<attributes>
			<attribute name="gradle_scope" value="main"/>
			<attribute name="gradle_used_by_scope" value="main,test"/>
		</attributes>
	</classpathentry>
	<classpathentry output="build/eclipse/main" kind="src" path="src/main/resources">
		<attributes>
			<attribute name="gradle_scope" value="main"/>
			<attribute name="gradle_used_by_scope" value="main,test"/>
		</attributes>
	</classpathentry>
	<classpathentry output="build/eclipse/test" kind="src" path="src/test/java">
		<attributes>
			<attribute name="gradle_scope" value="test"/>
			<attribute name="gradle_used_by_scope" value="test"/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
	<classpathentry output="build/eclipse/test" kind="src" path="src/test/resources">
		<attributes>
			<attribute name="gradle_scope" value="test"/>
			<attribute name="gradle_used_by_scope" value="test"/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21/"/>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/com.j256.ormlite/ormlite-jdbc/6.1/5105c0eb9dcc8a6bf0551c4f59af71b703394a60/ormlite-jdbc-6.1-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/com.j256.ormlite/ormlite-jdbc/6.1/ef6752d1bb9d7443ccd24b2be7c72a42cfe00f98/ormlite-jdbc-6.1.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value="main,test"/>
		</attributes>
	</classpathentry>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/org.mindrot/jbcrypt/0.4/69f76567491266abfba6be8be0eecf55dca852d2/jbcrypt-0.4-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/org.mindrot/jbcrypt/0.4/af7e61017f73abb18ac4e036954f9f28c6366c07/jbcrypt-0.4.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value="main,test"/>
		</attributes>
	</classpathentry>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.jupiter/junit-jupiter-params/5.9.3/d10dec2ad6dad92cdab830904e9bc4a1de4fd84a/junit-jupiter-params-5.9.3-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.jupiter/junit-jupiter-params/5.9.3/9e2a4bf6016a1975f408a73523392875cff7c26f/junit-jupiter-params-5.9.3.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value="test"/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.jupiter/junit-jupiter-api/5.9.3/85988e8197299a175eb2576f8f069fc84299a9f4/junit-jupiter-api-5.9.3-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.jupiter/junit-jupiter-api/5.9.3/815818ad6ffcc8d320d8fbdf3d748c753cf83201/junit-jupiter-api-5.9.3.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value="test"/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.platform/junit-platform-commons/1.9.3/86401c81baae1d05c5dc76d3e40c1b9397384eda/junit-platform-commons-1.9.3-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.platform/junit-platform-commons/1.9.3/36b2e26a90c41603be7f0094bee80e3f8a2cd4d4/junit-platform-commons-1.9.3.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value="test"/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.jupiter/junit-jupiter/5.9.3/5fd01c33132462aab3905cb74bd1097a713ab91a/junit-jupiter-5.9.3-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.jupiter/junit-jupiter/5.9.3/72e840501e1550e9799c9a5cc9483d7d6b29e0ba/junit-jupiter-5.9.3.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value="test"/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/org.opentest4j/opentest4j/1.2.0/41d55b3c2254de9837b4ec8923cbd371b8a7eab5/opentest4j-1.2.0-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/org.opentest4j/opentest4j/1.2.0/28c11eb91f9b6d8e200631d46e20a7f407f2a046/opentest4j-1.2.0.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value="test"/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/org.apiguardian/apiguardian-api/1.1.2/e0787a997746ac32639e0bf3cb27af8dce8a3428/apiguardian-api-1.1.2-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/org.apiguardian/apiguardian-api/1.1.2/a231e0d844d2721b0fa1b238006d15c6ded6842a/apiguardian-api-1.1.2.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value=""/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.jupiter/junit-jupiter-engine/5.9.3/197892276ba628c4cdca0ab3168f9c24ce6c73f8/junit-jupiter-engine-5.9.3-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.jupiter/junit-jupiter-engine/5.9.3/355322b03bf39306a183162cd06626c206f0286b/junit-jupiter-engine-5.9.3.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value="test"/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.platform/junit-platform-launcher/1.9.3/127cb253e495382cf9683a9acfaf7633bf27b2a7/junit-platform-launcher-1.9.3-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.platform/junit-platform-launcher/1.9.3/485650bfe2a2f39b606a6ca013285afda2eaee79/junit-platform-launcher-1.9.3.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value="test"/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
	<classpathentry sourcepath="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.platform/junit-platform-engine/1.9.3/819f0849cf19b1f46718c36a4fc8406c87bced45/junit-platform-engine-1.9.3-sources.jar" kind="lib" path="/home/user_name/.gradle/caches/modules-2/files-2.1/org.junit.platform/junit-platform-engine/1.9.3/8616734a190f8d307376aeb7353dba0a2c037a09/junit-platform-engine-1.9.3.jar">
		<attributes>
			<attribute name="gradle_used_by_scope" value="test"/>
			<attribute name="test" value="true"/>
		</attributes>
	</classpathentry>
</classpath>

build.gradle.kts

import org.gradle.plugins.ide.eclipse.model.Classpath
import org.gradle.plugins.ide.eclipse.model.SourceFolder

version = "0.1.0"
layout.buildDirectory = file("build/gradle")

plugins {
    // Apply the application plugin to add support for building a CLI application in Java.
    java
    application
    eclipse
}

repositories {
    // Use Maven Central for resolving dependencies.
    mavenCentral()
}

dependencies {
    // Use JUnit Jupiter for testing.
    testImplementation("org.junit.jupiter:junit-jupiter:5.9.3")

    testRuntimeOnly("org.junit.platform:junit-platform-launcher")

    // This dependency is used by the application.
    implementation("com.j256.ormlite:ormlite-jdbc:6.1")
    implementation("org.mindrot:jbcrypt:0.4")
}

// Apply a specific Java toolchain to ease working on different environments.
java {
    toolchain {
        languageVersion.set(JavaLanguageVersion.of(21))
    }
}

application {
    // Define the main class for the application.
    mainClass.set("carshow.App")
}

eclipse {
    classpath {
        defaultOutputDir = file("build/eclipse")
        file {
            whenMerged(
                    Action<Classpath> { ->
                        entries.filter { it.kind == "src" }.forEach {
                            if (it is SourceFolder) {
                                it.output = it.output.replace("bin/", "build/eclipse/")
                            }
                        }
                    }
            )
        }
    }
}

tasks.withType<JavaExec>() {
    standardInput = System.`in`
}

tasks.named<Test>("test") {
    // Use JUnit Platform for unit tests.
    useJUnitPlatform()
}

@snjeza
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snjeza commented Oct 8, 2023

@zefr0x Java LS doesn't support Java 21 yet.
Could you try to replace

<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21/"/>

with

<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-20/"/>

The related PR - Provide support for Java 21

@zefr0x
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zefr0x commented Oct 9, 2023 •
edited
Loading

Thanks,

It didn't work first, but it worked after changing it to JavaSE-17 and installing jdk17 in my system.

So I must also install the corresponding JDK in my system.

I also changed the Java version in build.gradle.kts, so I don't need to edit .classpath manually every time.

I didn't install jdk20 since it wasn't available in ArchLinux's official repos (it's no longer maintained).

@zefr0x zefr0x closed this as completed Oct 9, 2023
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@snjeza @zefr0x