javax.servlet.jsp.JspException cannot be resolved to a type javax.servlet.jsp.PageContext cannot be resolved to a type 解决这种类似异常需要加入:jsp-api.jar&servlet-api.jar 在tomcat安装目录的libs中有,复制粘贴到你的项目lib文件夹下Build Path一下就OK了!
一.现象描述 如下图所示,手动新建个类包calculator.py,想在test.py文件引用它,发现一直报红线,引用失败 Unresolved reference 'calculator' less... (Ctrl+F1) This inspection detects names that should resolve but don't. Due to dynamic dispatch and duck typing, this is possible in a limited but
首先一道题: public class User{ private String name; private int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public
问题详情 Error:Execution failed for task ':app:preDebugAndroidTestBuild'. > Conflict with dependency 'com.android.support:support-annotations' in project ':app'. Resolved versions for app (26.1.0) and test app (27.1.1) differ. See https://d.android.com/r
android studio 升级到3.1.3后总会遇到莫名其妙的错误,前几天刚解决了项目 dependencies报错的问题. 解决android studio 升级到3.0+之后 项目 dependencies报错问题 现在又遇到了gradle版本的问题, Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.1.3/gradle-3.1.3.pom