Nexus启动失败处理：The nexus service was launched, but failed to start.

升级了JDK为1.9后，Nexus启动就失败了：

查看%Nexus_HOME%下logs目录下的日志文件，如下：

jvm 1 | Caused by: java.lang.ClassNotFoundException: javax.xml.bind.JAXBContext
jvm 1 |    at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:466) ~[na:na]
jvm 1 |    at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:421) ~[jetty-webapp-8.1.16.v20140903.jar:8.1.16.v20140903]
jvm 1 |    at org.eclipse.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:383) ~[jetty-webapp-8.1.16.v20140903.jar:8.1.16.v20140903]
jvm 1 |    at org.apache.felix.framework.BundleWiringImpl.doImplicitBootDelegation(BundleWiringImpl.java:1738) ~[na:na]
jvm 1 |    at org.apache.felix.framework.BundleWiringImpl.searchDynamicImports(BundleWiringImpl.java:1675) ~[na:na]
jvm 1 |    at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1511) ~[na:na]
jvm 1 |    at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:75) ~[na:na]
jvm 1 |    at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1955) ~[na:na]
jvm 1 |    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496) ~[na:na]
jvm 1 |    at java.base/java.lang.Class.forName0(Native Method) ~[na:na]
jvm 1 |    at java.base/java.lang.Class.forName(Class.java:375) ~[na:na]
jvm 1 |    at java.base/sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114) ~[na:na]
jvm 1 |    ... 47 common frames omitted
wrapper | <-- Wrapper Stopped
wrapper | The nexus service was launched, but failed to start.

初步断定是安装了JDK9后，Nexus配置文件的问题:

在Nexus安装目录下，找到【\~\bin\jsw\conf】文件夹，打开【wrapper.conf】文件

找到这行：

# Set the JVM executable

下面有【wrapper.java.command=....】

将这行更改为【wrapper.java.command=自己的JDK安装目录\bin\java】即可（我修改为之前的jdk8的路径就可以了）。

以我的JDK安装目录为例子

wrapper.java.command=C:\Program Files (x86)\Java\jdk1.8.0_40\bin\java

Nexus启动失败处理：The nexus service was launched, but failed to start.

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