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  • JAVA报错Exception in thread “main” java.lang.NullPointerException 我在编写一个需要使用对象数组的代码发现了这个问题。 情况是:我在定义完一个对象数组后,打算给数组的各个元素对象赋值时,出现了报错 在...

    JAVA报错Exception in thread “main” java.lang.NullPointerException

    我在编写一个需要使用对象数组的代码发现了这个问题。

    情况是:我在定义完一个对象数组后,打算给数组的各个元素对象赋值时,出现了报错
    在这里插入代码片 Exception in thread "main" java.lang.NullPointerException at 对象数组.Str.main(Str.java:11)
    出现问题的原因:
    因为在我们定义的对象数组中,每一个元素都是一个对象,既然是对象肯定就要分配内存啊!部分人忽略了这个问题,所以才有了上面的错误。
    解决方法
    给对象数组中的每一个元素对象分配内存
    操作:对象[i]=new 对象的类名();

    举例:我自己的例子
    1.我定义一个类,类名为People,类里面只有一个变量age

    2.我再定义了一个Peopled的对象数组,长度为5个元素
    People [] young=new People[5];
    3.接下来我给对象数组中的每一个元素对象分配内存
    for(int i=0;i<5;i++) {
    young[i]=new People(); //分配内存
    young[i].age=a[i]; //给People数组中的每个元素赋值
    }
    问题解决了!

    下面是具体代码
    没有修改之前的代码:

    public class Str {
    	public static void main(String[] args) {
    		
    		int [] a= {16,17,18,19,18};
    		
    		People [] young=new People[5];//创建一个对象数组
    		
    		for(int i=0;i<5;i++) {
    			young[i].age=a[i];	//给People数组中的每个元素赋值
    		}
    		
    		for(int i=0;i<5;i++) {		//检验结果
    			System.out.print(young[i]);
    		}
    	}
    }
    
    class People{
    	int age;
    }
    

    修改后的代码:

    package 对象数组;
    
    public class Str {
    	public static void main(String[] args) {
    		
    		int [] a= {16,17,18,19,18};
    		
    		People [] young=new People[5];//创建一个对象数组
    		
    		for(int i=0;i<5;i++) {
    			young[i]=new People();			//给每个元素分配内存
    			young[i].age=a[i];	//给People数组中的每个元素赋值
    		}
    		
    		for(int i=0;i<5;i++) {		//检验结果
    			System.out.print(young[i].age+",");
    		}
    	}
    }
    
    class People{
    	int age;
    }
    

    运行结果:
    16,17,18,19,18,

    展开全文
  • Exception in thread "main" java.lang.Error: Unresolved compilation problem: Syntax error, insert ";" to complete Statement at cn.com.infosec.test.Rsaa.main(Rsaa.java:157)(线程"主要的"java.lang.e...

    怎样解决报错:

    Exception in thread "main" java.lang.Error: Unresolved compilation problem:

    Syntax error, insert ";" to complete Statement at cn.com.infosec.test.Rsaa.main(Rsaa.java:157)(线程"主要的"java.lang.error:未解决的编译问题异常:语法错误,插入"(2);",在cn.com.infosec.test.rsaa.main(rsaa.java:157)上完成语句)

    一开始是:

    然后我选中红波浪线删除就好了,如下第30行已经不报错了。

    明显的报错还容易解决,但隐性的就不好解决了,如下:

    把鼠标放在红叉的地方显示:Syntax error, insert ";" to complete Statement(语法错误,插入“;”以完成语句)

    执行代码后就报

    Exception in thread "main" java.lang.Error: Unresolved compilation problem:

    Syntax error, insert ";" to complete Statement at cn.com.infosec.test.Rsaa.main(Rsaa.java:157)(线程"主要的"java.lang.error:未解决的编译问题异常:语法错误,插入"(2);",在cn.com.infosec.test.rsaa.main(rsaa.java:157)上完成语句)错误。

    我百度了一下,他们说是由于jdk版本的问题,或者新建一个类,把代码复制过去就好了,但我改了还是不行。

    摸索挺久后,才发现了解决方法:

     如上图,将上图中的空白选中,并删除,就好了。

     总结:由于,这是在网上复制别人的代码,所以有些复制下来的代码会存在特殊字符,需要把他们都删除。实在找不到,只好老老实实自己敲一遍代码啦。总之,报这种错误有很多原因,就看你的原因是那种了。

    展开全文
  • 错误描述:系统服务错误 原因:主板驱动与Windows10系统存在兼容问题,系统上正在运行的某个软件与系统、主板存在兼容性问题。 解决方法:1、升级主板驱动。  2、关闭BIOS的虚拟处理器(CPU VT)技术。...

    错误描述:系统服务错误

    原因:主板驱动与Windows10系统存在兼容问题,系统上正在运行的某个软件与系统、主板存在兼容性问题。

    解决方法:1、升级主板驱动。

                      2、关闭BIOS的虚拟处理器(CPU  VT)技术。

                      3、卸载蓝屏之前启动的那个软件(要确定是这个软件导致的蓝屏,重启电脑,再次运行该软件是否蓝屏,若是则卸载该软件)。

                       4、重装系统或是恢复系统出厂设置(这两样基本上没什么区别,快慢、激活区别)。

    展开全文
  • Factory method ‘sqlSessionFactory’ threw exception; nested exception is java.lang.NoSuchMethodError: com.baomidou.mybatisplus.entity.GlobalConfiguration.getWorkerId()Ljava/lang/Long; org.apache....

    springboot 引入mybatis-plus后报错:

    Factory method ‘sqlSessionFactory’ threw exception; nested exception is java.lang.NoSuchMethodError: com.baomidou.mybatisplus.entity.GlobalConfiguration.getWorkerId()Ljava/lang/Long;

    org.apache.ibatis.binding.BindingException: Invalid bound statement (not found)

    Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
    13:48:24.428 ERROR o.s.boot.SpringApplication [845] - Application run failed
    org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'goodsController': Unsatisfied dependency expressed through field 'goodsService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'goodsService': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'goodsMapper' defined in file [D:\Program\webDemo\springbootDemo\target\classes\com\syc\dao\GoodsMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/spring/boot/starter/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NoSuchMethodError: com.baomidou.mybatisplus.entity.GlobalConfiguration.getWorkerId()Ljava/lang/Long;
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:586)
    	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1341)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
    	at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$127/2047744862.getObject(Unknown Source)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759)
    	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
    	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)
    	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:762)
    	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:398)
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1258)
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246)
    	at com.syc.DemoApplication.main(DemoApplication.java:19)
    Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'goodsService': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'goodsMapper' defined in file [D:\Program\webDemo\springbootDemo\target\classes\com\syc\dao\GoodsMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/spring/boot/starter/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NoSuchMethodError: com.baomidou.mybatisplus.entity.GlobalConfiguration.getWorkerId()Ljava/lang/Long;
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:586)
    	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1341)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
    	at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$127/2047744862.getObject(Unknown Source)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1135)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062)
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:583)
    	... 20 common frames omitted
    Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'goodsMapper' defined in file [D:\Program\webDemo\springbootDemo\target\classes\com\syc\dao\GoodsMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/spring/boot/starter/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NoSuchMethodError: com.baomidou.mybatisplus.entity.GlobalConfiguration.getWorkerId()Ljava/lang/Long;
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1436)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1323)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
    	at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$127/2047744862.getObject(Unknown Source)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1135)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062)
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:583)
    	... 34 common frames omitted
    Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [com/baomidou/mybatisplus/spring/boot/starter/MybatisPlusAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NoSuchMethodError: com.baomidou.mybatisplus.entity.GlobalConfiguration.getWorkerId()Ljava/lang/Long;
    	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:590)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1247)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1096)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:535)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
    	at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$127/2047744862.getObject(Unknown Source)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
    	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1135)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireByType(AbstractAutowireCapableBeanFactory.java:1421)
    	... 46 common frames omitted
    Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NoSuchMethodError: com.baomidou.mybatisplus.entity.GlobalConfiguration.getWorkerId()Ljava/lang/Long;
    	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
    	at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:582)
    	... 59 common frames omitted
    Caused by: java.lang.NoSuchMethodError: com.baomidou.mybatisplus.entity.GlobalConfiguration.getWorkerId()Ljava/lang/Long;
    	at com.baomidou.mybatisplus.spring.boot.starter.MybatisPlusAutoConfiguration.sqlSessionFactory(MybatisPlusAutoConfiguration.java:128)
    	at com.baomidou.mybatisplus.spring.boot.starter.MybatisPlusAutoConfiguration$$EnhancerBySpringCGLIB$$7de6a18f.CGLIB$sqlSessionFactory$2(<generated>)
    	at com.baomidou.mybatisplus.spring.boot.starter.MybatisPlusAutoConfiguration$$EnhancerBySpringCGLIB$$7de6a18f$$FastClassBySpringCGLIB$$a52ad39d.invoke(<generated>)
    	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
    	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361)
    	at com.baomidou.mybatisplus.spring.boot.starter.MybatisPlusAutoConfiguration$$EnhancerBySpringCGLIB$$7de6a18f.sqlSessionFactory(<generated>)
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	at java.lang.reflect.Method.invoke(Method.java:483)
    	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    	... 60 common frames omitted
    Disconnected from the target VM, address: '127.0.0.1:57027', transport: 'socket'
    
    Process finished with exit code 1
    

    解决:引入了两个mybatisplus且版本不一致导致的,去除mybatis-plus即可,因为mybatis-plus-boot-starter里也引用了mybatis-plus

            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus</artifactId>
                <version>2.3.1</version>
            </dependency>
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>2.3.3</version>
            </dependency>
    

    在这里插入图片描述

    展开全文
  • 2019-05-23 18:09:24.710 WARN 7792 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans....
  • windows蓝屏显示终止代码:SYSTEM_SERVICE_EXCEPTION 失效的操作ComputerZ_x64.sys 主要是CPU_Z出错,卸载重装鲁大师即可。
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