無法運行 CommandLineRunner (Spring Boot)

Question

每當我嘗試運行我的代碼時，我都會在這里收到此錯誤：

java.lang.IllegalStateException: Failed to execute CommandLineRunner
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:809) ~[spring-boot-2.4.4.jar:2.4.4]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:790) ~[spring-boot-2.4.4.jar:2.4.4]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:333) ~[spring-boot-2.4.4.jar:2.4.4]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1313) ~[spring-boot-2.4.4.jar:2.4.4]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1302) ~[spring-boot-2.4.4.jar:2.4.4]
    at de.hdm_stuttgart.finance_manager.FinanceManagerApplication.main(FinanceManagerApplication.java:24) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78) ~[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:567) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.4.4.jar:2.4.4]
Caused by: org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : de.hdm_stuttgart.finance_manager.model.Expenses.category -> de.hdm_stuttgart.finance_manager.model.Category; nested exception is java.lang.IllegalStateException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : de.hdm_stuttgart.finance_manager.model.Expenses.category -> de.hdm_stuttgart.finance_manager.model.Category
    at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:371) ~[spring-orm-5.3.5.jar:5.3.5]
    at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:235) ~[spring-orm-5.3.5.jar:5.3.5]
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:566) ~[spring-orm-5.3.5.jar:5.3.5]
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:743) ~[spring-tx-5.3.5.jar:5.3.5]
    at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:711) ~[spring-tx-5.3.5.jar:5.3.5]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:654) ~[spring-tx-5.3.5.jar:5.3.5]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:407) ~[spring-tx-5.3.5.jar:5.3.5]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.5.jar:5.3.5]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.5.jar:5.3.5]
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137) ~[spring-tx-5.3.5.jar:5.3.5]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.5.jar:5.3.5]
    at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:174) ~[spring-data-jpa-2.4.6.jar:2.4.6]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.5.jar:5.3.5]
    at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-5.3.5.jar:5.3.5]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.5.jar:5.3.5]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) ~[spring-aop-5.3.5.jar:5.3.5]
    at jdk.proxy4/jdk.proxy4.$Proxy82.save(Unknown Source) ~[na:na]
    at de.hdm_stuttgart.finance_manager.FinanceManagerApplication.lambda$demo$0(FinanceManagerApplication.java:31) ~[classes/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:806) ~[spring-boot-2.4.4.jar:2.4.4]
    ... 10 common frames omitted
Caused by: java.lang.IllegalStateException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : de.hdm_stuttgart.finance_manager.model.Expenses.category -> de.hdm_stuttgart.finance_manager.model.Category
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:151) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:188) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1366) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:453) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.internal.SessionImpl.flushBeforeTransactionCompletion(SessionImpl.java:3212) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.internal.SessionImpl.beforeTransactionCompletion(SessionImpl.java:2380) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.beforeTransactionCompletion(JdbcCoordinatorImpl.java:447) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.beforeCompletionCallback(JdbcResourceLocalTransactionCoordinatorImpl.java:183) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl.access$300(JdbcResourceLocalTransactionCoordinatorImpl.java:40) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:281) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:101) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:562) ~[spring-orm-5.3.5.jar:5.3.5]
    ... 26 common frames omitted
Caused by: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : de.hdm_stuttgart.finance_manager.model.Expenses.category -> de.hdm_stuttgart.finance_manager.model.Category
    at org.hibernate.engine.spi.CascadingActions$8.noCascade(CascadingActions.java:379) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:167) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.event.internal.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:159) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:149) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:82) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:39) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.event.service.internal.EventListenerGroupImpl.fireEventOnEachListener(EventListenerGroupImpl.java:93) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    at org.hibernate.internal.SessionImpl.doFlush(SessionImpl.java:1362) ~[hibernate-core-5.4.29.Final.jar:5.4.29.Final]
    ... 35 common frames omitted

這是我的啟動應用程序：

package de.hdm_stuttgart.finance_manager;

import de.hdm_stuttgart.finance_manager.model.Category;
import de.hdm_stuttgart.finance_manager.model.Expense;
import de.hdm_stuttgart.finance_manager.model.PaymentMethod;
import de.hdm_stuttgart.finance_manager.repository.ExpenseRepository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;

import java.util.Date;

@SpringBootApplication
public class FinanceManagerApplication {

    private static final Logger log = LoggerFactory.getLogger(FinanceManagerApplication.class);

    public static void main(String[] args) {
        SpringApplication.run(FinanceManagerApplication.class, args);
    }

    @Bean
    public CommandLineRunner demo(ExpenseRepository repo) {
        return (args) -> {
            log.info("Creating expense entities...");
            repo.save(new Expense(new Date(), 28.99, "Hai Vu", "Essen", new Category("Leisure"), PaymentMethod.CASH));

        };
    }

}

我的朋友有完全相同的代碼，但它適用於他們但不適用於我，我們不知道原因是什么。 配置都是一樣的，但是為什么CommandLineRunner運行失敗呢？

編輯：

所以我的 Expense class 或 ExpenseRepository 出了點問題，但我仍然不知道為什么。 與其他存儲庫一起工作，我也嘗試了一個帶有 PersonRepository 的新項目。 但 ExpenseRepository 總是失敗。 我也重命名了它，但總是得到這個異常......

這是我的費用 Model

package de.hdm_stuttgart.finance_manager.model;

import javax.persistence.*;
import java.math.BigDecimal;
import java.util.Date;

@Entity
public class Expense {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;

    @Temporal(TemporalType.DATE)
    private Date date;
    private BigDecimal amount;
    private String receiver;
    private String purpose;

    @ManyToOne
    private Category category;

    @Enumerated(EnumType.STRING)
    private PaymentMethod paymentMethod;

    public Expense(){}

    public Expense(Date date, BigDecimal amount, String receiver, String purpose, Category category, PaymentMethod paymentMethod) {
        this.date = date;
        this.amount = amount;
        this.receiver = receiver;
        this.purpose = purpose;
        this.category = category;
        this.paymentMethod = paymentMethod;
    }
}

我的 ExpenseRepository 就像這樣簡單

package de.hdm_stuttgart.finance_manager.repository;

import de.hdm_stuttgart.finance_manager.model.Expense;
import org.springframework.data.repository.CrudRepository;

public interface ExpenseRepository extends CrudRepository<Expense, Long> {
}

Answer 1

嘗試刪除 ExpenseRepository 並啟動應用程序。 如果它有效，則與 ExpenseRepository 相關的 package 掃描或與該存儲庫掃描關聯的實體未正確加載。