# Fail to run Open-GDS Junit test in Eclipse

**URL:** <https://community.neo4j.com/t/fail-to-run-open-gds-junit-test-in-eclipse/55116>\
**Category:** Graph Data Science / Graph Analytics\
**Created:** [April 21, 2022, 9:22am UTC](https://community.neo4j.com/t/fail-to-run-open-gds-junit-test-in-eclipse/55116 "2022-04-21T09:22:21Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Jean](https://sea1.discourse-cdn.com/flex021/user_avatar/community.neo4j.com/jean/32/20968_2.png) [@Jean](https://community.neo4j.com/u/Jean)\
**Post date:** [April 21, 2022, 9:22am UTC](https://community.neo4j.com/t/fail-to-run-open-gds-junit-test-in-eclipse/55116/1 "2022-04-21T09:22:21Z")

</div>

Hi, all,  
I'm planning to upgrade my GDS library 1.6.1 to higher version of OpenGDS 1.8.6 or 2.0.2， which my own algorithm is running with. My problem is , OpenGDS seems to be compiled and is running correctly in command line window, but test cases won't run in Eclipse.  
For example, when I try to run the Junit test case for ~/alpha/alpha-proc/src/main/java/org/neo4j/gds/spanningtree/KSpanningTreeProc.java, the test case ~/alpha/alpha-proc/src/test/java/org/neo4j/gds/KSpanningTreeProcTest.java, which I import to my Eclipse project to test, it just failed to load a test database with null pointer exception. Here's the stack trace, any idea?  
I think it may be some misconfigurations of pom.xml, and put it in the end.  
I import ~/alpha/alpha-algo/src/test/java/org/neo4j/gds/impl/spanningTree/PrimTest.java too, and it runs fine.

GDS version: 1.8.6  
Neo4j version: 4.4.5  
Operating system: Windows 10

```auto
java.lang.RuntimeException: Error starting Neo4j database server at D:\eclipse\workspace\OpenGDS\target\test data\org.neo4j.gds.KSpanningTreeProcTest\testb8a7cb238131887da6b7584838c57239\data\databases
	at org.neo4j.graphdb.facade.DatabaseManagementServiceFactory.startDatabaseServer(DatabaseManagementServiceFactory.java:228)
	at org.neo4j.graphdb.facade.DatabaseManagementServiceFactory.build(DatabaseManagementServiceFactory.java:181)
	at org.neo4j.test.TestDatabaseManagementServiceBuilder.newDatabaseManagementService(TestDatabaseManagementServiceBuilder.java:134)
	at org.neo4j.test.TestDatabaseManagementServiceBuilder.build(TestDatabaseManagementServiceBuilder.java:120)
	at org.neo4j.test.extension.DbmsSupportController.buildDbms(DbmsSupportController.java:163)
	at org.neo4j.test.extension.DbmsSupportController.startDbms(DbmsSupportController.java:99)
	at org.neo4j.test.extension.DbmsSupportController.startDbms(DbmsSupportController.java:87)
	at org.neo4j.test.extension.DbmsSupportExtension.beforeEach(DbmsSupportExtension.java:51)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeBeforeEachCallbacks$1(TestMethodTestDescriptor.java:159)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeBeforeMethodsOrCallbacksUntilExceptionOccurs$5(TestMethodTestDescriptor.java:195)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeBeforeMethodsOrCallbacksUntilExceptionOccurs(TestMethodTestDescriptor.java:195)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeBeforeEachCallbacks(TestMethodTestDescriptor.java:158)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:125)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:65)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:139)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:143)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$7(NodeTestTask.java:129)
	at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:126)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:84)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:108)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:88)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:54)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:67)
	at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:52)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:96)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:84)
	at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:98)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:542)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:770)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)
	Suppressed: java.lang.NullPointerException
		at org.neo4j.test.extension.DbmsSupportController.shutdown(DbmsSupportController.java:186)
		at org.neo4j.test.extension.DbmsSupportExtension.afterEach(DbmsSupportExtension.java:60)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAfterEachCallbacks$11(TestMethodTestDescriptor.java:253)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$12(TestMethodTestDescriptor.java:269)
		at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeAllAfterMethodsOrCallbacks$13(TestMethodTestDescriptor.java:269)
		at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAllAfterMethodsOrCallbacks(TestMethodTestDescriptor.java:268)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeAfterEachCallbacks(TestMethodTestDescriptor.java:252)
		at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:137)
		... 45 more
Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component 'org.neo4j.dbms.database.DefaultDatabaseInitializer@15cee630' was successfully initialized, but failed to start. Please see the attached cause exception "Receiver class org.neo4j.kernel.database.TestDatabaseIdRepository$RandomDatabaseIdRepository does not define or inherit an implementation of the resolved method abstract getByName(Lorg/neo4j/kernel/database/NormalizedDatabaseName;)Ljava/util/Optional; of interface org.neo4j.kernel.database.DatabaseIdRepository.".
	at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:463)
	at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:110)
	at org.neo4j.graphdb.facade.DatabaseManagementServiceFactory.startDatabaseServer(DatabaseManagementServiceFactory.java:219)
	... 58 more
Caused by: java.lang.AbstractMethodError: Receiver class org.neo4j.kernel.database.TestDatabaseIdRepository$RandomDatabaseIdRepository does not define or inherit an implementation of the resolved method abstract getByName(Lorg/neo4j/kernel/database/NormalizedDatabaseName;)Ljava/util/Optional; of interface org.neo4j.kernel.database.DatabaseIdRepository.
	at org.neo4j.kernel.database.DatabaseIdRepository.getByName(DatabaseIdRepository.java:59)
	at org.neo4j.kernel.database.MapCachingDatabaseIdRepository.lambda$getByName$0(MapCachingDatabaseIdRepository.java:49)
	at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1705)
	at org.neo4j.kernel.database.MapCachingDatabaseIdRepository.getByName(MapCachingDatabaseIdRepository.java:49)
	at org.neo4j.kernel.database.DatabaseIdRepository.getByName(DatabaseIdRepository.java:59)
	at org.neo4j.dbms.database.DefaultDatabaseManager.initialiseDefaultDatabase(DefaultDatabaseManager.java:51)
	at org.neo4j.dbms.database.DefaultDatabaseInitializer.start0(DefaultDatabaseInitializer.java:39)
	at org.neo4j.kernel.lifecycle.SafeLifecycle.transition(SafeLifecycle.java:124)
	at org.neo4j.kernel.lifecycle.SafeLifecycle.start(SafeLifecycle.java:138)
	at org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:442)
	... 60 more

```

Here's my pom.xml for the maven project.

```auto
<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>cn.jean.neo4j</groupId>
	<artifactId>gds-extend</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>Neo4j Spanning Arborescence</name>
	<description>Neo4j procedure for min &amp; K spanning arborescence of
		directed graph
	</description>

	<properties>
		<java.version>11</java.version>
		<maven.compiler.release>${java.version}</maven.compiler.release>

		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8
		</project.reporting.outputEncoding>
		<neo4j.version>4.4.5</neo4j.version>
		<neo4j-java-driver.version>4.4.5</neo4j-java-driver.version>
		<junit-jupiter.version>5.8.2</junit-jupiter.version>
		<maven-shade-plugin.version>3.2.4</maven-shade-plugin.version>
		<maven-compiler-plugin.version>3.10.1</maven-compiler-plugin.version>
		<assertj.version>3.22.0</assertj.version>
		<maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
	</properties>

	<dependencies>
		<!-- This gives us the Procedure API our runtime code uses. We have a `provided` 
			scope on it, because when this is deployed in a Neo4j Instance, the API will 
			be provided by Neo4j. If you add non-Neo4j dependencies to this project, 
			their scope should normally be `compile` -->
		<dependency>
			<groupId>org.neo4j</groupId>
			<artifactId>neo4j</artifactId>
			<version>${neo4j.version}</version>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>org.neo4j.gds</groupId>
			<artifactId>core</artifactId>
			<version>1.8.6</version>
			<scope>provided</scope>
		</dependency>

		<!-- Contains the basic algorithm infrastructure -->
		<dependency>
			<groupId>org.neo4j.gds</groupId>
			<artifactId>algo-common</artifactId>
			<version>1.8.6</version>
			<scope>provided</scope>
		</dependency>

		<!-- Contains the productized algorithms -->
		<dependency>
			<groupId>org.neo4j.gds</groupId>
			<artifactId>algo</artifactId>
			<version>1.8.6</version>
			<scope>provided</scope>
		</dependency>

		<!-- Contains some alpha algorithms -->
		<dependency>
			<groupId>org.neo4j.gds</groupId>
			<artifactId>alpha-algo</artifactId>
			<version>1.8.6</version>
			<scope>provided</scope>
		</dependency>

		<!-- Contains the basic procedure infrastructure -->
		<dependency>
			<groupId>org.neo4j.gds</groupId>
			<artifactId>proc-common</artifactId>
			<version>1.8.6</version>
			<scope>provided</scope>
		</dependency>

		<!-- Contains the productized algorithm procedures -->
		<dependency>
			<groupId>org.neo4j.gds</groupId>
			<artifactId>proc</artifactId>
			<version>1.8.6</version>
			<scope>provided</scope>
		</dependency>

		<!-- Contains some alpha algorithm procedures -->
		<dependency>
			<groupId>org.neo4j.gds</groupId>
			<artifactId>alpha-proc</artifactId>
			<version>1.8.6</version>
			<scope>provided</scope>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.neo4j.gds/test-utils -->
		<dependency>
			<groupId>org.neo4j.gds</groupId>
			<artifactId>test-utils</artifactId>
			<version>1.8.6</version>
			<scope>test</scope>
		</dependency>

		<!-- https://mvnrepository.com/artifact/org.immutables/value -->
		<dependency>
			<groupId>org.immutables</groupId>
			<artifactId>value</artifactId>
			<version>2.8.8</version>
			<scope>provided</scope>
		</dependency>

		<dependency>
			<groupId>org.realityforge.org.jetbrains.annotations</groupId>
			<artifactId>org.jetbrains.annotations</artifactId>
			<version>1.7.0</version>
			<scope>provided</scope>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>${maven-compiler-plugin.version}</version>
			</plugin>
			<plugin>
				<artifactId>maven-surefire-plugin</artifactId>
				<version>${maven-surefire-plugin.version}</version>
			</plugin>
			<plugin>
				<!-- This generates a jar-file with our procedure code, plus any dependencies 
					marked as `compile` scope. This should then be deployed in the `plugins` 
					directory of each Neo4j instance in your deployment. After a restart, the 
					procedure is available for calling. -->
				<artifactId>maven-shade-plugin</artifactId>
				<version>${maven-shade-plugin.version}</version>
				<configuration>
					<createDependencyReducedPom>false</createDependencyReducedPom>
				</configuration>
				<executions>
					<execution>
						<phase>package</phase>
						<goals>
							<goal>shade</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>

</project>

```

---

<div class="post-metadata">

**Author:** ![Jean](https://sea1.discourse-cdn.com/flex021/user_avatar/community.neo4j.com/jean/32/20968_2.png) [@Jean](https://community.neo4j.com/u/Jean)\
**Post date:** [April 21, 2022, 1:49pm UTC](https://community.neo4j.com/t/fail-to-run-open-gds-junit-test-in-eclipse/55116/2 "2022-04-21T13:49:14Z")

</div>

gradle :proc-test:test --tests org.neo4j.gds.impl.spanningTree.KSpanningTreeProcTest

The command above is O.K., but failed in Eclipse Junit test.

---

<div class="post-metadata">

**Author:** ![Jean](https://sea1.discourse-cdn.com/flex021/user_avatar/community.neo4j.com/jean/32/20968_2.png) [@Jean](https://community.neo4j.com/u/Jean)\
**Post date:** [April 21, 2022, 3:11pm UTC](https://community.neo4j.com/t/fail-to-run-open-gds-junit-test-in-eclipse/55116/3 "2022-04-21T15:11:40Z")

</div>

It's a configuration problem, I address the problem by matching the neo4j version according to the version mentioned in build.gradle.