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我正在从 Tomcat 7 -> Tomcat 8 升级服务，而我刚刚遇到这个问题，我有点不知所措。

这是堆栈跟踪：

    SEVERE: Failed to process JAR found at URL [] for ServletContainerInitializers for context with name [{1}]
java.net.MalformedURLException: no !/ in spec
    at java.net.URL.<init>(URL.java:619)
    at java.net.URL.<init>(URL.java:482)
    at java.net.URL.<init>(URL.java:431)
    at java.net.JarURLConnection.parseSpecs(JarURLConnection.java:179)
    at java.net.JarURLConnection.<init>(JarURLConnection.java:162)
    at sun.net.www.protocol.jar.JarURLConnection.<init>(JarURLConnection.java:81)
    at sun.net.www.protocol.jar.Handler.openConnection(Handler.java:41)
    at java.net.URL.openConnection(URL.java:971)
    at java.net.URL.openStream(URL.java:1037)
    at org.apache.catalina.startup.WebappServiceLoader.parseConfigFile(WebappServiceLoader.java:161)
    at org.apache.catalina.startup.WebappServiceLoader.load(WebappServiceLoader.java:118)
    at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1616)
    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1128)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:771)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305)
Caused by: java.lang.NullPointerException: no !/ in spec
    at sun.net.www.protocol.jar.Handler.parseAbsoluteSpec(Handler.java:170)
    at sun.net.www.protocol.jar.Handler.parseURL(Handler.java:150)
    at java.net.URL.<init>(URL.java:614)
    ... 24 more

我知道整个“URL []”和“名称为 [{1}] 的上下文”看起来很糟糕，但我不知道为什么，也不知道这些值是如何按原样设置的。任何人都可以请我指出发生了什么的正确方向吗？

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