测试在进行一次性能测试的时候发现并发300个请求时出现了下面的异常: HTTP Status 500 - Handler processing failed; nested exception is java.lang.OutOfMemoryError: unable to create new native thread 看到这个异常有点发慌,毕竟并发程序写的少,突然来这么一个确实有点找不着背.但不管怎么样还是先搜索一下是啥原因吧. 这个错误是因为无法再创建新线程导致的,原因可能是没有更多的空…

问题: Springboot启动报错: Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.…

Conversion to Dalvik format failed: Unable to execute dex: Multiple dex files define ... 这个错误是因为有两个相同的jar包,删除其中一个就可以正常运行了.…

I'm using ubuntu14 LTS. Problems: 1. When run roscore, got a mistake and an advice to ping the localhost. 2. Nearly every time I run a directive with sudo, I got a warning that unable to resolve host. It turns out, the reason is I changed the ubuntu…

把myeclipse10 按照目录完整拷贝到了另外一台电脑, 另外的目录 原安装目录 D\:\soft\i\myeclipse10 新安装目录 E\:\soft\myeclipse10 双击启动失败, 查看日志 could not find .. javax.transaction_1.1.1.v201105210645.jar ... java.lang.IllegalStateException: Unable to acquire application service. Ensure t…

突然模拟器报错:unable to boot the simulator(无法启动模拟器) 试了好几种解决办法,删除所有的模拟器重启以后再添加,删除钥匙串登陆中的证书,重新安装Xcode都不行 最后通过这种方式解决了 重新启动mac 进度条加载的时候一直按command+R进入设置界面,打开界面的左上角实用工具里面的终端,输入csrutil disable回车 然后点击左上角的重新启动mac. 启动以后进入终端输入:sudo chmod 0777 /private/tmp  然后回车 OK啦,模…

安装cocoapods,记录两个问题! 1.镜像已经替换成了 http://ruby.taobao.org/, 还是不能不能安装cocoapods, 报错:Unable to download data from http://ruby.taobao.org/ - bad response Not Found 404 (http://ruby.taobao.org/latest_specs.4.8.gz) 如图: 原来是ruby.taobao.org已经停止基于 HTTP 协议的镜像服务, 启用…

在进行版本的迭代更新时,新功能需求需要对主页面的UI进行重新的布局,但是,报了错误,出了好多约束方面的问题: Unable to simultaneously satisfy constraints. Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out whi…

今天继续作大死,趟php7的配置的坑. 照例,安装了昨天的各种扩展之后,解压php7的压缩文件到 /usr/local/. 然后开始配置config的扩展: ./configure --prefix=/usr/local/php7 \ --with-gd \ --with-freetype-dir \ --enable-gd-native-ttf \ --enable-mysqlnd \ --with-pdo-mysql=mysqlnd \ --with-openssl \ --with-mcr…

错误:Server Tomcat v7.0 Server at localhost was unable to start within 45 seconds 错误提示就是我们限定了部署的时间导致的错误.   解决方式一: 进入你的eclipse工作目录,修改 workspace\.metadata\.plugins\org.eclipse.wst.server.core\servers.xml文件. 把其中的start-timeout="45" 改为  start-timeout=&…