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Graph/2142d29b-94af-42c0-b443-b78ef0f8b271

Problemunvalidated

IntelliJ IDEA fails to compile/run Java programs using JDK 8 and reports: "java: invalid flag: --add-modules".

2142d29b-94af-42c0-b443-b78ef0f8b271

IntelliJ IDEA fails to compile/run Java programs using JDK 8 and reports: "java: invalid flag: --add-modules".

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Updated5/1/2026

PageRank0.0003

Effectiveness0.000

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48 linked nodes

DESCRIBESQuestion

DESCRIBESQuestion

DESCRIBESQuestion

DESCRIBESQuestion

ESCALATES_TOProblem

TestEngine with ID 'junit-jupiter' failed to discover tests — While updating JUnit from 5.11.4 to 5.12.1. Tension: OutputDirectoryProvider not available. Outcome: This should be resolved in 5.12.2.

CAUSED_BYRootCause

The build/run configuration includes the JVM option --add-modules, which is only supported starting with Java 9 (Java Platform Module System). JDK 8 does not recognize this flag.

CAUSED_BYRootCause

Change `source` & `target` from 8 to 24. Tension: modules are not supported in -source 8. Outcome: Tell IntelliJ to synchronize the POM. Do a Maven `clean`. Run your app.

PERTAIN_TODomain

Dependency Resolution

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Version Compatibility

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Compiler Configuration

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Integration Testing

PERTAIN_TOProblem

TestEngine with ID 'junit-jupiter' failed to discover tests — While updating JUnit from 5.11.4 to 5.12.1. Tension: OutputDirectoryProvider not available. Outcome: This should be resolved in 5.12.2.

FIXED_BYSolution

Set `android.disableMinifyLocalDependenciesForLibraries=false` in `gradle.properties` (and ensure the project uses the correct Hilt/R8 configuration for the AGP version). Then rebuild so the required Hilt-generated classes are retained across modules.

FIXED_BYSolution

Disable minification (set minifyEnabled to false) or update proguard-rules.pro to keep the required OpenJSSE/JDK internal classes by applying the missing keep rules from missing_rules.txt.

FIXED_BYSolution

What’s the correct way to bundle JavaFX dependencies into an executable `.jar` (or `.exe`) file — so that it runs on any system without requiring external JavaFX setup. Tension: the `.jar` fails to run independently. Outcome: Used IntelliJ’s “Build Artifacts → JAR → From modules with dependencies”.

FIXED_BYSolution

Remove or conditionally disable the --add-modules JVM argument for Java 8, or switch the project/run configuration to use a Java 9+ JDK.

FIXED_BYSolution

resolved in JDK26 — on Windows 11 with JDK25. Outcome: no errors.

FIXED_BYSolution

Exclude classes and packages option in Run configuration -> modify options — With intellij. Tension: This makes it impossible to see the coverage for just my manual API call. Outcome: use Exclude classes and packages option in Run configuration -> modify options.

FIXED_BYSolution

Use `-Didea.max.intellisense.filesize=5000` — in the vmoptions cofig file. Tension: it incerased the limit to 5 MB and solves the problem. Outcome: solves the problem.

FIXED_BYSolution

Change `source` & `target` from 8 to 24 — Tell IntelliJ to synchronize the POM. Do a Maven `clean`. Run your app. Tension: modules are not supported in -source 8.

FIXED_BYSolution

Install a JDK that includes javac (e.g., run `sudo dnf install java-devel`), or switch Gradle to use the JDK bundled with Android Studio by setting `org.gradle.java.home` to the Android Studio JBR path in `android/gradle.properties`.

FIXED_BYSolution

For Java 21,. Tension: to show all modules attempted to be loaded. Outcome: Filter from there for Java packages as needed.

FIXED_BYSolution

Use latest IntelliJ, preferably installed automatically via the JetBrains Toolbox app. — Getting started with Java can be frustrating. Tension: I cannot tell from your description exactly where things went off the rails. Outcome: First be sure you have installed the latest version of IntelliJ.

FIXED_BYSolution

update the JAVA_HOME environment variable — if you are using it. Tension: move your JDK to the path your IDE is looking for it. Outcome: That should be enough to solve the current issue.

FIXED_BYSolution

Version of java source and target that you want maven compiler plugin to support.

FIXED_BYSolution

Make sure you import `Executable` from the right source. Tension: IntelliJ suggests importing the one from `java.lang.reflect`. Outcome: Assertions.assertAll(exec);.

FIXED_BYSolution

-javaagent:${settings.localRepository}/org/mockito/mockito-core/${mockito.version}/mockito-core-${mockito.version}.jar — maven-surefire-plugin. Tension: the warning is still displayed. Outcome: Finally fixed, both in command line and IDE (IntelliJ IDEA).

FIXED_BYSolution

test with `javac --version`, not `java --version`! — In some unusual cases, those two can report different versions. Outcome: those two can report different versions.

FIXED_BYSolution

Use the IntelliJ IDEA Workspaces feature (Workspace plugin): create a workspace as a new project type, name the workspaces folder, and add all the required projects there, subject to current limitations.

OCCURS_ONOperatingSystem

OCCURS_ONOperatingSystem

OCCURS_INLanguage

OCCURS_INLanguage

OCCURS_INPackage

INSTANCE_OFClusterConcept

Dependency & Toolchain Skew

Edit Cancel on Focus Change

Digest-Then-Sign JWTs

R8 Minification Class Stripping

Tooltip Selector Breakage

Manual Updates After Disabling

JDK Version Mismatch Builds

JDK/Toolchain Compatibility Drift

Build Env Divergence

Missing Java Service Provider

JDK Toolchain Version Skew

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