NoClassDeFoundError 해결 방법

NoClassDeFoundError

• JPA 환경설정 중에 NoClassDeFoundError가 발생하였다.
• Maven 환경 기반에서 설정 중이었다.

11월 29, 2021 2:19:15 오후 org.hibernate.jpa.internal.util.LogHelper logPersistenceUnitInformation
INFO: HHH000204: Processing PersistenceUnitInfo [
	name: hello
	...]
11월 29, 2021 2:19:16 오후 org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.3.10.Final}
11월 29, 2021 2:19:16 오후 org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException
	at org.hibernate.boot.spi.XmlMappingBinderAccess.<init>(XmlMappingBinderAccess.java:43)
	at org.hibernate.boot.MetadataSources.<init>(MetadataSources.java:86)
	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.<init>(EntityManagerFactoryBuilderImpl.java:212)
	at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.<init>(EntityManagerFactoryBuilderImpl.java:174)
	at org.hibernate.jpa.boot.spi.Bootstrap.getEntityManagerFactoryBuilder(Bootstrap.java:76)
	at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilder(HibernatePersistenceProvider.java:171)
	at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:119)
	at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:61)
	at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:50)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
	at hellojpa.JpaMain.main(JpaMain.java:8)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBException
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	... 12 more

Process finished with exit code 1

• java 11에서 실행하였고 java8에서 사용하던 아래의 dependency가 java11 에서는 빠졌기 때문에 오류가 발생한 거였다.

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.1</version>
</dependency>

• pom.xml로 이동하여서 추가해주면 된다.
• pom.xml에 추가하는 방법을 모르시는 분들을 위해 전체 코드를 추가해 놓겠습니다.
  

  <?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>jpa-basic</groupId>
      <artifactId>ex1-hello-jpa</artifactId>
      <version>1.0.0</version>
  
      <dependencies>
          <dependency>
              <groupId>org.hibernate</groupId>
              <artifactId>hibernate-entitymanager</artifactId>
              <version>5.3.10.Final</version>
          </dependency>
          <dependency>
              <groupId>com.h2database</groupId>
              <artifactId>h2</artifactId>
              <version>1.4.199</version>
          </dependency>
  <!--        <dependency>-->
  <!--            <groupId>javax.xml.bind</groupId>-->
  <!--            <artifactId>jaxb-api</artifactId>-->
  <!--            <version>2.3.1</version>-->
  <!--        </dependency>-->
      </dependencies>
  
      <properties>
          <maven.compiler.source>11</maven.compiler.source>
          <maven.compiler.target>11</maven.compiler.target>
      </properties>
  
  </project>​

• 주석 부분에 추가하시면 됩니다!