sudo add-apt-repository ppa:webupd8team/java sudo apt-get update udo apt-key adv --recv-key --keyserver keyserver.ubuntu.com xxxxxx(提示缺少的key) sudo apt-get install oracle-java8|6|7-installer sudo apt-get install oracle-java8-set-default…

java.io.NotSerializableException: test.io.file.Student    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183)    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)    at test.io.file.Demo4.test2(Demo4.java:36)…

org.apache.ibatis.exceptions.PersistenceException: ### Error querying database.  Cause: org.apache.ibatis.builder.BuilderException: Error invoking SqlProvider method (com.github.abel533.mapper.MapperProvider.dynamicSQL).  Cause: java.lang.Instantiati…

=======华丽分割线(工具总结)===================== 1:Maven项目中junit测试找不到主类的问题 Class not found com.test.utils.test java.lang.ClassNotFoundException: com.test.utils.test at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URL…

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'daoSupport': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name…

由于没有正常关机导致eclipse无法将数据正常写入配置文件导致无法启动.报这样一个异常 An internal error occurred during: "reload maven project". java.lang.NullPointerException 查看workspace/.metadata/.log发现如下异常: !ENTRY org.eclipse.core.resources 2 10035 2015-12-15 09:31:13.488 !MESSAGE T…

方法1:把SpringBoot中main方法所在的class不再继承org.springframework.boot.context.web.SpringBootServletInitializer即可 因为继承org.springframework.boot.context.web.SpringBootServletInitializer,并重写里面的configure方法,即可将这个项目打成war,并部署到tomcat或其它jee容器中. protected SpringApplicatio…

出现如下错误: java.lang.Exception: No runnable methods at org.junit.runners.BlockJUnit4ClassRunner.validateInstanceMethods(BlockJUnit4ClassRunner.java:191) at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:…

java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: Path expected for join! [from com.tao.pojo.Student inner join clazz] at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:133) at…

java.lang.IllegalArgumentException: Cannot create TypedQuery for query with more than one return using requested result type [com.tao.pojo.Student] at org.hibernate.internal.AbstractSharedSessionContract.resultClassChecking(AbstractSharedSessionContr…