InteliJ Plugin development: Java class not found exception

Hi,

Please share you Gradle build script and related Gradle files.

import org.jetbrains.changelog.Changelog
import org.jetbrains.changelog.markdownToHTML
import org.jetbrains.intellij.platform.gradle.Constants.Constraints
import org.jetbrains.intellij.platform.gradle.TestFrameworkType

plugins {
    id("java") // Java support
    alias(libs.plugins.kotlin) // Kotlin support
    alias(libs.plugins.intelliJPlatform) // IntelliJ Platform Gradle Plugin
    alias(libs.plugins.changelog) // Gradle Changelog Plugin
    alias(libs.plugins.qodana) // Gradle Qodana Plugin
    alias(libs.plugins.kover) // Gradle Kover Plugin
}

group = providers.gradleProperty("pluginGroup").get()
version = providers.gradleProperty("pluginVersion").get()

// Set the JVM language level used to build the project.
kotlin {
    jvmToolchain(17)
}

java {
    sourceCompatibility = JavaVersion.VERSION_17
}

// Configure project's dependencies
repositories {
    mavenCentral()

    // IntelliJ Platform Gradle Plugin Repositories Extension - read more: https://plugins.jetbrains.com/docs/intellij/tools-intellij-platform-gradle-plugin-repositories-extension.html
    intellijPlatform {
        defaultRepositories()
    }
}


// Dependencies are managed with Gradle version catalog - read more: https://docs.gradle.org/current/userguide/platforms.html#sub:version-catalog
dependencies {
    testImplementation(libs.junit)

    // IntelliJ Platform Gradle Plugin Dependencies Extension - read more: https://plugins.jetbrains.com/docs/intellij/tools-intellij-platform-gradle-plugin-dependencies-extension.html
    intellijPlatform {
        create(providers.gradleProperty("platformType"), providers.gradleProperty("platformVersion"))

        // Plugin Dependencies. Uses `platformBundledPlugins` property from the gradle.properties file for bundled IntelliJ Platform plugins.
        bundledPlugins(providers.gradleProperty("platformBundledPlugins").map { it.split(',') })

        // Plugin Dependencies. Uses `platformPlugins` property from the gradle.properties file for plugin from JetBrains Marketplace.
        plugins(providers.gradleProperty("platformPlugins").map { it.split(',') })

        instrumentationTools()
        pluginVerifier()
        zipSigner()
        testFramework(TestFrameworkType.Platform)
    }
}

// Configure IntelliJ Platform Gradle Plugin - read more: https://plugins.jetbrains.com/docs/intellij/tools-intellij-platform-gradle-plugin-extension.html
intellijPlatform {
    pluginConfiguration {
        version = providers.gradleProperty("pluginVersion")

        // Extract the <!-- Plugin description --> section from README.md and provide for the plugin's manifest
        description = providers.fileContents(layout.projectDirectory.file("README.md")).asText.map {
            val start = "<!-- Plugin description -->"
            val end = "<!-- Plugin description end -->"

            with(it.lines()) {
                if (!containsAll(listOf(start, end))) {
                    throw GradleException("Plugin description section not found in README.md:\n$start ... $end")
                }
                subList(indexOf(start) + 1, indexOf(end)).joinToString("\n").let(::markdownToHTML)
            }
        }

        val changelog = project.changelog // local variable for configuration cache compatibility
        // Get the latest available change notes from the changelog file
        changeNotes = providers.gradleProperty("pluginVersion").map { pluginVersion ->
            with(changelog) {
                renderItem(
                    (getOrNull(pluginVersion) ?: getUnreleased())
                        .withHeader(false)
                        .withEmptySections(false),
                    Changelog.OutputType.HTML,
                )
            }
        }

        ideaVersion {
            sinceBuild = providers.gradleProperty("pluginSinceBuild")
            untilBuild = providers.gradleProperty("pluginUntilBuild")
        }
    }

    signing {
        certificateChain = providers.environmentVariable("CERTIFICATE_CHAIN")
        privateKey = providers.environmentVariable("PRIVATE_KEY")
        password = providers.environmentVariable("PRIVATE_KEY_PASSWORD")
    }

    publishing {
        token = providers.environmentVariable("PUBLISH_TOKEN")
        // The pluginVersion is based on the SemVer (https://semver.org) and supports pre-release labels, like 2.1.7-alpha.3
        // Specify pre-release label to publish the plugin in a custom Release Channel automatically. Read more:
        // https://plugins.jetbrains.com/docs/intellij/deployment.html#specifying-a-release-channel
        channels = providers.gradleProperty("pluginVersion").map { listOf(it.substringAfter('-', "").substringBefore('.').ifEmpty { "default" }) }
    }

    pluginVerification {
        ides {
            recommended()
        }
    }
}

// Configure Gradle Changelog Plugin - read more: https://github.com/JetBrains/gradle-changelog-plugin
changelog {
    groups.empty()
    repositoryUrl = providers.gradleProperty("pluginRepositoryUrl")
}

// Configure Gradle Kover Plugin - read more: https://github.com/Kotlin/kotlinx-kover#configuration
kover {
    reports {
        total {
            xml {
                onCheck = true
            }
        }
    }
}

tasks {
    wrapper {
        gradleVersion = providers.gradleProperty("gradleVersion").get()
    }

    publishPlugin {
        dependsOn(patchChangelog)
    }
}

val runIdeForUiTests by intellijPlatformTesting.runIde.registering {
    task {
        jvmArgumentProviders += CommandLineArgumentProvider {
            listOf(
                "-Drobot-server.port=8082",
                "-Dide.mac.message.dialogs.as.sheets=false",
                "-Djb.privacy.policy.text=<!--999.999-->",
                "-Djb.consents.confirmation.enabled=false",
            )
        }
    }

    plugins {
        robotServerPlugin(Constraints.LATEST_VERSION)
    }
}

Gradlew

#!/bin/sh

# Attempt to set APP_HOME

# Resolve links: $0 may be a link
app_path=$0

# Need this for daisy-chained symlinks.
while
    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
    [ -h "$app_path" ]
do
    ls=$( ls -ld "$app_path" )
    link=${ls#*' -> '}
    case $link in             #(
      /*)   app_path=$link ;; #(
      *)    app_path=$APP_HOME$link ;;
    esac
done

# This is normally unused
# shellcheck disable=SC2034
APP_BASE_NAME=${0##*/}
# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
' "$PWD" ) || exit

# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD=maximum

warn () {
    echo "$*"
} >&2

die () {
    echo
    echo "$*"
    echo
    exit 1
} >&2

# OS specific support (must be 'true' or 'false').
cygwin=false
msys=false
darwin=false
nonstop=false
case "$( uname )" in                #(
  CYGWIN* )         cygwin=true  ;; #(
  Darwin* )         darwin=true  ;; #(
  MSYS* | MINGW* )  msys=true    ;; #(
  NONSTOP* )        nonstop=true ;;
esac

CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar


# Determine the Java command to use to start the JVM.
if [ -n "$JAVA_HOME" ] ; then
    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
        # IBM's JDK on AIX uses strange locations for the executables
        JAVACMD=$JAVA_HOME/jre/sh/java
    else
        JAVACMD=$JAVA_HOME/bin/java
    fi
    if [ ! -x "$JAVACMD" ] ; then
        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi
else
    JAVACMD=java
    if ! command -v java >/dev/null 2>&1
    then
        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation."
    fi
fi

# Increase the maximum file descriptors if we can.
if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
    case $MAX_FD in #(
      max*)
        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
        # shellcheck disable=SC2039,SC3045
        MAX_FD=$( ulimit -H -n ) ||
            warn "Could not query maximum file descriptor limit"
    esac
    case $MAX_FD in  #(
      '' | soft) :;; #(
      *)
        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
        # shellcheck disable=SC2039,SC3045
        ulimit -n "$MAX_FD" ||
            warn "Could not set maximum file descriptor limit to $MAX_FD"
    esac
fi


if "$cygwin" || "$msys" ; then
    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )

    JAVACMD=$( cygpath --unix "$JAVACMD" )

    # Now convert the arguments - kludge to limit ourselves to /bin/sh
    for arg do
        if
            case $arg in                                #(
              -*)   false ;;                            # don't mess with options #(
              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
                    [ -e "$t" ] ;;                      #(
              *)    false ;;
            esac
        then
            arg=$( cygpath --path --ignore --mixed "$arg" )
        fi
        # Roll the args list around exactly as many times as the number of
        # args, so each arg winds up back in the position where it started, but
        # possibly modified.
        #
        # NB: a `for` loop captures its iteration list before it begins, so
        # changing the positional parameters here affects neither the number of
        # iterations, nor the values presented in `arg`.
        shift                   # remove old arg
        set -- "$@" "$arg"      # push replacement arg
    done
fi


# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'


set -- \
        "-Dorg.gradle.appname=$APP_BASE_NAME" \
        -classpath "$CLASSPATH" \
        org.gradle.wrapper.GradleWrapperMain \
        "$@"

# Stop when "xargs" is not available.
if ! command -v xargs >/dev/null 2>&1
then
    die "xargs is not available"
fi



eval "set -- $(
        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
        xargs -n1 |
        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
        tr '\n' ' '
    )" '"$@"'

exec "$JAVACMD" "$@"

gradle.properties

# IntelliJ Platform Artifacts Repositories -> https://plugins.jetbrains.com/docs/intellij/intellij-artifacts.html

pluginGroup = com.github.saafpluginadmin.saafplugin
pluginName = saaf-plugin
pluginRepositoryUrl = https://github.com/SaafPluginAdmin/saaf-plugin
# SemVer format -> https://semver.org
pluginVersion = 0.0.1

# Supported build number ranges and IntelliJ Platform versions -> https://plugins.jetbrains.com/docs/intellij/build-number-ranges.html
pluginSinceBuild = 232
pluginUntilBuild = 242.*

# IntelliJ Platform Properties -> https://plugins.jetbrains.com/docs/intellij/tools-gradle-intellij-plugin.html#configuration-intellij-extension
platformType = IC
platformVersion = 2023.2.7

# Plugin Dependencies -> https://plugins.jetbrains.com/docs/intellij/plugin-dependencies.html
# Example: platformPlugins = com.jetbrains.php:203.4449.22, org.intellij.scala:2023.3.27@EAP
platformPlugins =
# Example: platformBundledPlugins = com.intellij.java
platformBundledPlugins =

# Gradle Releases -> https://github.com/gradle/gradle/releases
gradleVersion = 8.9

# Opt-out flag for bundling Kotlin standard library -> https://jb.gg/intellij-platform-kotlin-stdlib
kotlin.stdlib.default.dependency = false

# Enable Gradle Configuration Cache -> https://docs.gradle.org/current/userguide/configuration_cache.html
org.gradle.configuration-cache = true

# Enable Gradle Build Cache -> https://docs.gradle.org/current/userguide/build_cache.html
org.gradle.caching = true

gradlew.bat

@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem      https://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@rem SPDX-License-Identifier: Apache-2.0
@rem

@if "%DEBUG%"=="" @echo off
@rem ##########################################################################
@rem
@rem  Gradle startup script for Windows
@rem
@rem ##########################################################################

@rem Set local scope for the variables with windows NT shell
if "%OS%"=="Windows_NT" setlocal

set DIRNAME=%~dp0
if "%DIRNAME%"=="" set DIRNAME=.
@rem This is normally unused
set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%

@rem Resolve any "." and ".." in APP_HOME to make it shorter.
for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi

@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"

@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome

set JAVA_EXE=java.exe
%JAVA_EXE% -version >NUL 2>&1
if %ERRORLEVEL% equ 0 goto execute

echo. 1>&2
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2

goto fail

:findJavaFromJavaHome
set JAVA_HOME=%JAVA_HOME:"=%
set JAVA_EXE=%JAVA_HOME%/bin/java.exe

if exist "%JAVA_EXE%" goto execute

echo. 1>&2
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
echo. 1>&2
echo Please set the JAVA_HOME variable in your environment to match the 1>&2
echo location of your Java installation. 1>&2

goto fail

:execute
@rem Setup the command line

set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar


@rem Execute Gradle
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*

:end
@rem End local scope for the variables with windows NT shell
if %ERRORLEVEL% equ 0 goto mainEnd

:fail
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
rem the _cmd.exe /c_ return code!
set EXIT_CODE=%ERRORLEVEL%
if %EXIT_CODE% equ 0 set EXIT_CODE=1
if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
exit /b %EXIT_CODE%

:mainEnd
if "%OS%"=="Windows_NT" endlocal

:omega

Thanks. I don't see any issue with your build script, but the screenshots indicate some errors. I don't understand why your main/java and main/kotlin directories are not marked as sources. Did you import the Gradle project model after creating the project? In the Gradle tool window click Reload All Gradle Projects.

If it doesn't help, please share the project sources.

Done it. Now it marks them as sources but the same error is still there. Any ideas ? 

Also there is weird setup, I have two gradle directories now. I guess its using the top one when i try to run the runIde. 

Your project structure looks strange.

Why do you have saaf-plugin-main directories twice? You probably created a directory and cloned it to the directory with the same name, resulting in double dir. Either open the internal one or move your file to the top-level directory and open the top-level in the IDE.

After cleaning this up, import and build the project and see whether the build/classes contains the classes that are highlighted in red in the plugin.xml.

If not, see what is the log message. Are there any errors?

Ive cloned the project anew with proper structure. Now im not sure how to add java files as another source beside Kotlin directory. Just adding the directory and files leads to same error.

Finally got it. It is built under different path. I saw it when i looked into build folder. Thank you for help !!