MockBukkit#mock() throwing NPE-CodePudding

I'm trying to test my Minecraft plugin with MockBukkit, but when I'm trying to mock a server (via MockBukkit#mock()) a NPE is thrown:

java.lang.NullPointerException: Cannot invoke "org.eclipse.aether.RepositorySystem.newLocalRepositoryManager(org.eclipse.aether.RepositorySystemSession, org.eclipse.aether.repository.LocalRepository)" because "this.repository" is null

    at org.bukkit.plugin.java.LibraryLoader.<init>(LibraryLoader.java:59)
    at org.bukkit.plugin.java.JavaPluginLoader.<init>(JavaPluginLoader.java:73)
    at be.seeseemelk.mockbukkit.plugin.PluginManagerMock.<init>(PluginManagerMock.java:90)
    at be.seeseemelk.mockbukkit.ServerMock.<init>(ServerMock.java:166)
    at be.seeseemelk.mockbukkit.MockBukkit.mock(MockBukkit.java:56)

Here you can find my pom.xml: https://pastebin.com/TPjDRr9f My test contains just a method with the annotation @BeforeAll in which I mock via MockBukkit#mock(). This issue is also mentioned here https://github.com/MockBukkit/MockBukkit/issues/614, but this issue is currently in backlog, so I'm trying to find a solution / workaround for this.

I tried mocking the server in a test method with the annotation @BeforeAll:

@BeforeAll
public void setUp() {
    MockBukkit.mock();
}

I expected the test to work.

I actually got a NPE, which origin's located in the MockBukkit code.

CodePudding user response：

So I finally managed to fix this error: it occured because of this dependency:

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>2.0.4</version>
</dependency>

Watch this for updates: https://github.com/MockBukkit/MockBukkit/issues/614