java javax.servlet_java.lang.NoClassDefFoundError: javax/servlet/ServletOutputStream 报错解决

报错的方法栈

在ssm中写了一个 utils 类，定义了main方法测试和查看工具实际数据

运行main方法时报错了，之前都没错，莫名其妙报了错

java.lang.NoClassDefFoundError: javax/servlet/ServletOutputStream

at java.lang.Class.getDeclaredMethods0(Native Method)

at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)

at java.lang.Class.privateGetMethodRecursive(Class.java:3048)

at java.lang.Class.getMethod0(Class.java:3018)

at java.lang.Class.getMethod(Class.java:1784)

at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)

at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)

Caused by: java.lang.ClassNotFoundException: javax.servlet.ServletOutputStream

at .URLClassLoader.findClass(URLClassLoader.java:381)

at java.lang.ClassLoader.loadClass(ClassLoader.java:424)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338)

at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

... 7 more

Error: A JNI error has occurred, please check your installation and try again

Exception in thread "main"

解决办法

pom.xml 中引入的 servlet-api中定义了 provided，把这里的provided改成compile