java.lang.NoClassDefFoundError: javax/servlet/ServletOutputStream 報錯解決

報錯的方法棧

在ssm中寫了一個 utils 類，定義了main方法測試和查看工具實際數據
運行main方法時報錯了，之前都沒錯，莫名其妙報了錯

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 java.net.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" 

解決辦法

pom.xml 中引入的 servlet-api中定義了 <scope>provided</scope>，把這里的provided改成compile

轉載地址作者：https://www.cnblogs.com/zongJianKun/p/10956263.html