Tag Archives: other

Solution to GitHub desktop login error: failed to fetch

Today is my first day to use github Desktop. When I try to log in with my account, an error occurs: Failed to fetch. This is so depressing. While I was searching that problem on Baidu, I found some other developers also met that problem, but I found no answer.

Then I searched that problem on Bing with English, I found a similar github issue. Some warm-hearted developer suggested that firewall or DNS problems can result in that kind of error. Then I found this is a network error. It is difficult visit Making in China. So, I runned a vpn, then the problem is solved. So, Check you firewall and network.

today was my first day on the github desktop. An error occurred when I tried to log in using my account: could not get. It’s frustrating. When I searched for this question on Baidu, I found that some other developers had also encountered this question, but I couldn’t find the answer.
then I searched the problem in English on Bing and found a similar github problem. Some avid developers have suggested that a firewall or DNS problem could cause this error. Then I realized it was a network mistake. It’s hard to visit Github in China. So, I ran a VPN and the problem was fixed. So check your firewall and network.

Springboot integrated with mybatis

springBoot integration mybatis

#springBoot integration with the first mybatis project
1. Create a new normal maven project
2. Use idea’s easycode to automatically generate the controller, entity, service and dao layer code
3. Simple pom configuration, independent of error 

  java.lang.annotation.AnnotationFormatError: Invalid default: public abstract java.lang.Class tk.mybatis.spring.annotation.MapperScan.factoryBean()


依赖如下：

   <dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>  
       <version>2.1.0</version>
   </dependency>
    <dependency>
       <groupId>com.oracle</groupId>
       <artifactId>ojdbc6</artifactId>
       <version>11.2.0.4</version>
   </dependency>


4.  配置简单的yml，不配置会报找不到

mybatis:
mapper-locations:类路径:mapper/* . xml

One or more filters failed to start

error message: 

严重: One or more Filters failed to start. Full details will be found in the appropriate container log file
一月 31, 2020 5:45:46 下午 org.apache.catalina.core.StandardContext startInternal
严重: Context [/edaily-web] startup failed due to previous errors
一月 31, 2020 5:45:46 下午 org.springframework.web.context.support.XmlWebApplicationContext doClose

to view the tomcat log file that comes with idea:

can see the error message :(basic meaning there is no signout filter condition in shiroFilter, need to add) 

严重: Exception starting filter shiroFilter
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'shiroFilter': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalArgumentException: There is no filter with name 'signout' to apply to chain [/api/logout] in the pool of available Filters.  Ensure a filter with that name/path has first been registered with the addFilter method(s).
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:175)
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1512)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:250)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:198)
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:962)
	at org.springframework.web.filter.DelegatingFilterProxy.initDelegate(DelegatingFilterProxy.java:324)
	at org.springframework.web.filter.DelegatingFilterProxy.initFilterBean(DelegatingFilterProxy.java:235)
	at org.springframework.web.filter.GenericFilterBean.init(GenericFilterBean.java:199)
	at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)
	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)
	at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4841)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5535)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)
	at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1809)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.__invoke(DelegatingMethodAccessorImpl.java:43)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:45009)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:45012)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
	at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618)
	at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.__invoke(DelegatingMethodAccessorImpl.java:43)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:45009)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:45012)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
	at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)
	at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
	at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
	at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)
	at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.__invoke(DelegatingMethodAccessorImpl.java:43)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:45009)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:45012)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346)
	at sun.rmi.transport.Transport$1.run(Transport.java:200)
	at sun.rmi.transport.Transport$1.run(Transport.java:197)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: There is no filter with name 'signout' to apply to chain [/api/logout] in the pool of available Filters.  Ensure a filter with that name/path has first been registered with the addFilter method(s).
	at org.apache.shiro.web.filter.mgt.DefaultFilterChainManager.addToChain(DefaultFilterChainManager.java:265)
	at org.apache.shiro.web.filter.mgt.DefaultFilterChainManager.createChain(DefaultFilterChainManager.java:148)
	at org.apache.shiro.spring.web.ShiroFilterFactoryBean.createFilterChainManager(ShiroFilterFactoryBean.java:397)
	at org.apache.shiro.spring.web.ShiroFilterFactoryBean.createInstance(ShiroFilterFactoryBean.java:437)
	at org.apache.shiro.spring.web.ShiroFilterFactoryBean.getObject(ShiroFilterFactoryBean.java:343)
	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168)
	... 64 more

because I have filterChainDefinitions configuring an action on signout in shiroFilter, but springMVC did not write filter interceptors for signout, such as @requestmapping (” /signout “), which spring context checks for when started, so report this. Comment out < ! –/api/logout=signout–> Just fine. 

	<!--shiro 请求拦截器，这里的 bean id 一定要对应 web.xml 中的filter-name，否则找不到这个拦截器-->
	<bean id="shiroFilter" class="org.apache.shiro.spring.web.ShiroFilterFactoryBean">
		<property name="securityManager" ref="securityManager"></property>
		<!-- 没有权限或者失败后跳转的页面 -->
		<property name="loginUrl"
				  value="www.baidu.com" />
		<property name="filterChainDefinitions">
			<value>
				/api/login=anon
				/api/register=anon
				<!--/api/logout=signout-->
				/**=authc
			</value>
		</property>
	</bean>


A repeated string is composed of two identical strings. For example, abcabc is a repeated string with length of 6, while abcba does not have a duplicate string. Given any string, please help Xiaoqiang find the longest repeated substring.

a repeating string is a concatenation of two identical strings. For example, abcabc is a repeating string of length 6, while abcba does not have a repeating string.
given any string, find the longest repeating substring.

input description :

enter a string s, where s is less than 1e4 and contains only Numbers and letters.

output description :

outputs an integer representing the length of the longest repeating substring of s. If it does not exist, 0

is output

input example 1:

xabcabcx

output example 1:

6

def getMaxRepeatSubstringLength(inputStr):
    length = len(inputStr)
    for i in reversed(range(length//2)):
        count = 0
        for j in range(length - i):
            if inputStr[j] == inputStr[j+i]:
                count = count + 1
            else:
                if length - j <= 2 * i:
                    break
                count = 0
            if count == i:
                return count * 2
    return 0
inputStr = input()
print(getMaxRepeatSubstringLength(inputStr))

1. First assume the length of the longest repeating substring is I
2. Judge whether the length of the assumption is I is true
3. The longest repeating substring cannot be more than half of the total length
4. In the process of determining whether the hypothesis is true, if the remaining length to be determined is less than 2* I, the hypothesis must be false
5. Since it is the judgment of the eldest string, it is reasonable to assume that I is from large to small, and once it is met, you can withdraw directly. Whereas the assumption from small to large is to check all the cases.