fail-fast

How to make Spring server to start even if database is down?

由 青春壹個敷衍的年華 提交于 2020-12-01 00:34:40
问题 I'm using a Spring Boot(1.4.7) & MyBatis. spring.main1.datasource.url=jdbc:mariadb://192.168.0.11:3306/testdb?useUnicode=true&characterEncoding=utf8&autoReconnect=true&socketTimeout=5000&connectTimeout=3000 spring.main1.datasource.username=username spring.main1.datasource.password=password spring.main1.datasource.driverClassName=org.mariadb.jdbc.Driver spring.main1.datasource.tomcat.test-on-borrow=true spring.main1.datasource.tomcat.test-while-idle=true spring.main1.datasource.tomcat

How to make Spring server to start even if database is down?

由 白昼怎懂夜的黑 提交于 2020-12-01 00:33:48
问题 I'm using a Spring Boot(1.4.7) & MyBatis. spring.main1.datasource.url=jdbc:mariadb://192.168.0.11:3306/testdb?useUnicode=true&characterEncoding=utf8&autoReconnect=true&socketTimeout=5000&connectTimeout=3000 spring.main1.datasource.username=username spring.main1.datasource.password=password spring.main1.datasource.driverClassName=org.mariadb.jdbc.Driver spring.main1.datasource.tomcat.test-on-borrow=true spring.main1.datasource.tomcat.test-while-idle=true spring.main1.datasource.tomcat

How to make Spring server to start even if database is down?

由 我的梦境 提交于 2020-12-01 00:33:06
问题 I'm using a Spring Boot(1.4.7) & MyBatis. spring.main1.datasource.url=jdbc:mariadb://192.168.0.11:3306/testdb?useUnicode=true&characterEncoding=utf8&autoReconnect=true&socketTimeout=5000&connectTimeout=3000 spring.main1.datasource.username=username spring.main1.datasource.password=password spring.main1.datasource.driverClassName=org.mariadb.jdbc.Driver spring.main1.datasource.tomcat.test-on-borrow=true spring.main1.datasource.tomcat.test-while-idle=true spring.main1.datasource.tomcat

How can I make JAXB to fail when a mandatory element is missing?

由 天涯浪子 提交于 2020-01-03 04:34:10
问题 I'm trying to add some forward compatibility to a Java application calling a Web Service at work, but JAXB seems to behave backward on the subject... The application use the wsdl2java Maven plugin to generate a CXF Web Service client from a WSDL. It then uses that generated client to communicate with a Web Service (through SOAP over JMS). When the Web Service sends an unknown element in its response to a call, JAXB fails with an "unexpected element" error, which is understandable, and XML

Java中容器的迭代器的fail-fast机制

由 橙三吉。 提交于 2019-12-06 09:28:54
Iterator<Integer> keys = gradeMap.keySet().iterator(); while(keys.hasNext()){ Integer i = keys.next(); if(!gradesIds.contains(i)){ // keys.remove(); gradeMap.remove(i); } } 调用HashMap的reomve方法时会出现 java.util.ConcurrentModificationException 。 解决方法就是先用Iterator的方法remove,然后再调用HashMap的remove方法！！即代码如下： Iterator<Integer> keys = gradeMap.keySet().iterator(); while(keys.hasNext()){ Integer i = keys.next(); if(!gradesIds.contains(i)){ keys.remove(); gradeMap.remove(i); } } 产生此问题的原因 引用于网络： 当使用 fail-fast iterator 对 Collection 或 Map 进行迭代操作过程中尝试直接修改 Collection / Map 的内容时，即使是在单线程下运行， java.util

fail-fast原理以及解决办法

由 孤街浪徒 提交于 2019-12-05 13:41:52
1.背景 今天处理一个多线程业务，这个业务原来是在单线程中运行的，现在对这个业务进行改造，使其能在多线程中运行以加快处理效率。结果抛出了 ConcurrentModificationException 异常。究其原因，原来此业务使用了ArrayList来存储数据。而ArrayList集合是不支持在多线程中使用的，因为在多线程中，一个线程通过iterator去遍历某集合的过程中，若该集合内容被其他线程所改变，那么（遍历线程的集合）就会抛出ConcurrentModificationException异常。这是集合的fai-fast机制（具体原理请见后面内容） 2.什么是fail-fast fail-fast 机制是java集合(Collection)中的一种错误机制。 当多个线程对同一个集合的内容进行操作时， 就可能 会产生fail-fast事件。例如：当某一个线程A通过iterator去遍历某集合的过程中，若该集合的内容被其他线程所改变了；那么线程A访问集合时，就会抛出ConcurrentModificationException异常，产生fail-fast事件。 为什么说是有可能会产生fail-fast事件 ？因为迭代器的快速失败行为无法得到保证，因为一般来说，不可能对是否出现不同步并发修改做出任何硬性保证。快速失败迭代器会尽最大努力抛出

fail-fast iterator

由 我们两清 提交于 2019-11-28 04:42:49
问题 I get this definition : As name suggest fail-fast Iterators fail as soon as they realized that structure of Collection has been changed since iteration has begun . what it mean by since iteration has begun ? is that mean after Iterator it=set.iterator() this line of code? public static void customize(BufferedReader br) throws IOException{ Set<String> set=new HashSet<String>(); // Actual type parameter added **Iterator it=set.iterator();** 回答1: First of all, they are fail- fast , not fail-

Gracefully handling corrupted state exceptions

由 自作多情 提交于 2019-11-27 19:24:16
Related to this question , I would like to force CLR to let my .NET 4.5.2 app catch Corrupted State Exceptions, for the sole purpose of logging them and then terminating the application. What's the correct way to do this, if I have catch (Exception ex) at several places around the app? So, after I specify the <legacyCorruptedStateExceptionsPolicy> attribute, if I understood correctly, all the catch (Exception ex) handlers will catch exceptions like AccessViolationException and happily continue. Yeah, I know catch (Exception ex) is a Bad Idea™, but if CLR would at least put the correct stack

Hystrix Configuration

由 不羁的心 提交于 2019-11-27 11:20:12
问题 I am trying to implement hystrix for my application using hystrix-javanica. I have configured hystrix-configuration.properties as below hystrix.command.default.execution.isolation.strategy=SEMAPHORE hystrix.command.default.execution.isolation.thread.timeoutInMilliseconds=10000 hystrix.command.default.fallback.enabled=true hystrix.command.default.circuitBreaker.enabled=true hystrix.command.default.circuitBreaker.requestVolumeThreshold=3 hystrix.command.default.circuitBreaker

Gracefully handling corrupted state exceptions

由 元气小坏坏 提交于 2019-11-26 22:48:14
问题 Related to this question, I would like to force CLR to let my .NET 4.5.2 app catch Corrupted State Exceptions, for the sole purpose of logging them and then terminating the application. What's the correct way to do this, if I have catch (Exception ex) at several places around the app? So, after I specify the <legacyCorruptedStateExceptionsPolicy> attribute, if I understood correctly, all the catch (Exception ex) handlers will catch exceptions like AccessViolationException and happily continue
订阅 fail-fast