SpringBoot 1.5.9.RELEASE启动报错：JpaVendorAdapter实例化失败

Hey there, let's break down why your Spring Boot + JPA app is throwing that annoying NoClassDefFoundError and how to fix it. I’ve looked over your config and pom, and here’s what’s going wrong:

Your Current Setup #

application.properties Configuration #

server.port: 8083
spring.datasource.url=jdbc:mysql://localhost:3306/restdb
spring.datasource.username=ricky
spring.datasource.password=ricky
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

The Root Cause in Your pom.xml #

Your pom includes explicit Hibernate dependencies that are causing version conflicts:

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-entitymanager</artifactId>
</dependency>
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
</dependency>

The problem here is that Spring Boot’s spring-boot-starter-parent already manages all compatible dependency versions automatically. The spring-boot-starter-data-jpa starter already includes hibernate-core and hibernate-entitymanager, while spring-boot-starter-web covers hibernate-validator. When you add these dependencies manually without specifying versions, Maven might pull in versions that don’t match what Spring Boot expects, leading to missing classes like org.hibernate.OptimisticLockException.

The Solution #

Remove those three explicit Hibernate dependencies from your pom.xml. Here’s the cleaned-up, working version:

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.chatrabazar</groupId>
<artifactId>SpringBootRest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>SpringBootRest</name>
<description>Demo Project for Spring boot and Spring Rest</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath />
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Then follow these steps to ensure everything works smoothly:

• Clean and rebuild your project with Maven: run mvn clean install to wipe old dependencies and pull in the correct, Spring Boot-managed versions
• Restart your Spring Boot application

This should resolve the NoClassDefFoundError because you’re now relying on Spring Boot’s curated dependency versions that are guaranteed to work together.

内容的提问来源于stack exchange，提问作者Gautam Tyagi