1、打开新建的servlet文件例如（hibernate.cfg.xml）修改头文件为
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
2、打开项目所在目录下的.settings文件夹
2.1修改项目的设置，打开项目.settings目录下的org.eclipse.jdt.core.prefs（打开工具例如NOTEPAD++）
把1.5改成1.8，例如：
1 eclipse.preferences.version=1 2 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled 3 org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8 4 org.eclipse.jdt.core.compiler.compliance=1.8 5 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error 6 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error 7 org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning 8 org.eclipse.jdt.core.compiler.source=1.8
2.2打开org.eclipse.wst.common.project.facet.core.xml
把<installed facet="java" version="1.5"/>改成<installed facet="java" version="1.8"/>，把 <installed facet="jst.web" version="2.3"/>改成 <installed facet="jst.web" version="3.0"/>
1 <?xml version="1.0" encoding="UTF-8"?> 2 <faceted-project> 3 <fixed facet="wst.jsdt.web"/> 4 <installed facet="jst.web" version="3.0"/> 5 <installed facet="wst.jsdt.web" version="1.0"/> 6 <installed facet="jboss.m2" version="1.0"/> 7 <installed facet="java" version="1.8"/> 8 <installed facet="jst.cdi" version="1.0"/> 9 </faceted-project>
3、打开存放依赖的pom.xml文件，修改最下面的
<build>
<finalName>D5.22hotai</finalName>
</build>
为
1 <build> 2 <finalName>D5.22hotai</finalName> 3 <plugins> 4 <plugin> 5 <groupId>org.apache.maven.plugins</groupId> 6 <artifactId>maven-compiler-plugin</artifactId> 7 <version>3.3</version> 8 <configuration> 9 <!-- 指定source和target的版本 --> 10 <source>1.8</source> 11 <target>1.8</target> 12 </configuration> 13 </plugin> 14 </plugins> 15 </build>
4、重启eclipse或者右键选中工程maven→ Update Project...