I managed to implement a small project that allows me to save data in my Neo4j database. However, when I add dependencies spring-boot-starter-data-jpa and ojdbc11, without any other modifications, I get the error message below. I have searched the internet without any success. I have tried implementing different transaction management methods for JPA and Neo4j without success. I don't know if anyone can help me use both dependencies in the same application.
The complete code is available here:link to spring-neo4j source code
Error during migration: Cannot invoke "org.springframework.transaction.support.TransactionTemplate.execute(org.springframework.transaction.support.TransactionCallback)" because "this.transactionTemplate" is null
2025-04-15T09:43:12.236+01:00 INFO 20716 --- [spring-neo4j] [ restartedMain] .s.b.a.l.ConditionEvaluationReportLogger :
Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
2025-04-15T09:43:12.264+01:00 ERROR 20716 --- [spring-neo4j] [ restartedMain] o.s.boot.SpringApplication : Application run failed
java.lang.NullPointerException: Cannot invoke "org.springframework.transaction.support.TransactionTemplate.execute(org.springframework.transaction.support.TransactionCallback)" because "this.transactionTemplate" is null
at org.springframework.data.neo4j.core.Neo4jTemplate.save(Neo4jTemplate.java:382) ~[spring-data-neo4j-7.4.4.jar:7.4.4]
at org.springframework.data.neo4j.repository.support.SimpleNeo4jRepository.save(SimpleNeo4jRepository.java:120) ~[spring-data-neo4j-7.4.4.jar:7.4.4]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:359) ~[spring-aop-6.2.5.jar:6.2.5]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker$RepositoryFragmentMethodInvoker.lambda$new$0(RepositoryMethodInvoker.java:277) ~[spring-data-commons-3.4.4.jar:3.4.4]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:170) ~[spring-data-commons-3.4.4.jar:3.4.4]
at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:158) ~[spring-data-commons-3.4.4.jar:3.4.4]
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:515) ~[spring-data-commons-3.4.4.jar:3.4.4]
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:284) ~[spring-data-commons-3.4.4.jar:3.4.4]
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:731) ~[spring-data-commons-3.4.4.jar:3.4.4]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.2.5.jar:6.2.5]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:174) ~[spring-data-commons-3.4.4.jar:3.4.4]
at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:149) ~[spring-data-commons-3.4.4.jar:3.4.4]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.2.5.jar:6.2.5]
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:69) ~[spring-data-commons-3.4.4.jar:3.4.4]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.2.5.jar:6.2.5]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:380) ~[spring-tx-6.2.5.jar:6.2.5]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-6.2.5.jar:6.2.5]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.2.5.jar:6.2.5]
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:138) ~[spring-tx-6.2.5.jar:6.2.5]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.2.5.jar:6.2.5]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:223) ~[spring-aop-6.2.5.jar:6.2.5]
at jdk.proxy4/jdk.proxy4.$Proxy110.save(Unknown Source) ~[na:na]
at com.example.service.NeoTransactionService.addExtbTransactionNode(NeoTransactionService.java:30) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:359) ~[spring-aop-6.2.5.jar:6.2.5]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:196) ~[spring-aop-6.2.5.jar:6.2.5]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-6.2.5.jar:6.2.5]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:380) ~[spring-tx-6.2.5.jar:6.2.5]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-6.2.5.jar:6.2.5]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:184) ~[spring-aop-6.2.5.jar:6.2.5]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:727) ~[spring-aop-6.2.5.jar:6.2.5]
at com.example.service.NeoTransactionService$$SpringCGLIB$$0.addExtbTransactionNode(<generated>) ~[classes/:na]
at com.example.Neo4jRunner.run(Neo4jRunner.java:40) ~[classes/:na]
at org.springframework.boot.SpringApplication.lambda$callRunner$5(SpringApplication.java:788) ~[spring-boot-3.4.4.jar:3.4.4]
at org.springframework.util.function.ThrowingConsumer$1.acceptWithException(ThrowingConsumer.java:82) ~[spring-core-6.2.5.jar:6.2.5]
at org.springframework.util.function.ThrowingConsumer.accept(ThrowingConsumer.java:60) ~[spring-core-6.2.5.jar:6.2.5]
at org.springframework.util.function.ThrowingConsumer$1.accept(ThrowingConsumer.java:86) ~[spring-core-6.2.5.jar:6.2.5]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:796) ~[spring-boot-3.4.4.jar:3.4.4]
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:787) ~[spring-boot-3.4.4.jar:3.4.4]
at org.springframework.boot.SpringApplication.lambda$callRunners$3(SpringApplication.java:772) ~[spring-boot-3.4.4.jar:3.4.4]
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[na:na]
at java.base/java.util.stream.SortedOps$SizedRefSortingSink.end(SortedOps.java:357) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:510) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[na:na]
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[na:na]
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[na:na]
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[na:na]
at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:772) ~[spring-boot-3.4.4.jar:3.4.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:325) ~[spring-boot-3.4.4.jar:3.4.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1361) ~[spring-boot-3.4.4.jar:3.4.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1350) ~[spring-boot-3.4.4.jar:3.4.4]
at com.example.SpringNeo4jApplication.main(SpringNeo4jApplication.java:10) ~[classes/:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:568) ~[na:na]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:50) ~[spring-boot-devtools-3.4.4.jar:3.4.4]
2025-04-15T09:43:12.277+01:00 INFO 20716 --- [spring-neo4j] [ restartedMain] o.s.b.w.e.tomcat.GracefulShutdown : Commencing graceful shutdown. Waiting for active requests to complete
2025-04-15T09:43:12.495+01:00 INFO 20716 --- [spring-neo4j] [tomcat-shutdown] o.s.b.w.e.tomcat.GracefulShutdown : Graceful shutdown complete
2025-04-15T09:43:12.499+01:00 INFO 20716 --- [spring-neo4j] [ restartedMain] o.neo4j.driver.internal.InternalDriver : Closing driver instance 2128206805
2025-04-15T09:43:12.731+01:00 INFO 20716 --- [spring-neo4j] [ restartedMain] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2025-04-15T09:43:12.735+01:00 INFO 20716 --- [spring-neo4j] [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2025-04-15T09:43:12.751+01:00 INFO 20716 --- [spring-neo4j] [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
The pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.4.4</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>spring-neo4j</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-neo4j</name>
<description>Demo project for Spring Boot</description>
<url/>
<licenses>
<license/>
</licenses>
<developers>
<developer/>
</developers>
<scm>
<connection/>
<developerConnection/>
<tag/>
<url/>
</scm>
<properties>
<java.version>17</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc11</artifactId>
<version>21.11.0.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-neo4j</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<annotationProcessorPaths>
<path>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</path>
</annotationProcessorPaths>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
Based on this github discussion 2931 as well as related issues from that thread.
Especially the following idea:
The
Neo4jDataAutoConfigurationwill only create a*Neo4j*TransactionManagerif there is no otherTransactionManageralready instantiated. This means if the JPA tx manager was created first, there won't be a second one unless it gets defined manually.
It means that you have to instantiate it on your own something like:
Declare a Ne4jTemplate
@Configuration(proxyBeanMethods = false)
public class Neo4jConfig {
@Bean({"neo4jTemplate"})
@ConditionalOnMissingBean({Neo4jOperations.class})
public Neo4jTemplate neo4jTemplate(
Neo4jClient neo4jClient,
Neo4jMappingContext neo4jMappingContext,
Driver driver, DatabaseSelectionProvider databaseNameProvider, ObjectProvider<TransactionManagerCustomizers> optionalCustomizers
) {
Neo4jTransactionManager transactionManager = new Neo4jTransactionManager(driver, databaseNameProvider);
optionalCustomizers.ifAvailable((customizer) -> {
customizer.customize(transactionManager);
});
return new Neo4jTemplate(neo4jClient, neo4jMappingContext, transactionManager);
}
}
As well as you Repository layer will be for instance something like:
public interface Repository<T,V> {
Optional<T> findById(String id);
T save(T instance);
}
@Repository
public class ExtbTransactionRepositoryImpl implements Repository<Transaction, String> {
private final Neo4jTemplate neo4jTemplate;
public ExtbTransactionRepositoryImpl(Neo4jTemplate neo4jTemplate) {
this.neo4jTemplate = neo4jTemplate;
}
@Override
public Optional<Transaction> findById(String id) {
return neo4jTemplate.findById(id, Transaction.class);
}
@Override
public Transaction save(Transaction instance) {
return neo4jTemplate.save(instance);
}
}
It should fix the issue and you will have a ready to use solution.