tomcat 启动 证书异常java.io.IOException: Alias name [cas] does not identify a key entry

　　在搭建CAS server的过程中，Tomcat开启https，配置秘钥证书，证书是通过keytool生成的

<Connector port="" protocol="org.apache.coyote.http11.Http11Protocol"
               maxThreads="" SSLEnabled="true" scheme="https" secure="true"
               clientAuth="true" sslProtocol="TLS" keystoreFile="/home/workspace/server.keystore"
               keystorePass=""/>

　　启动tamcat后，提示如下报错

org.apache.catalina.LifecycleException: Failed to initialize component [Connector[org.apache.coyote.http11.Http11Protocol-]]
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:)
    at org.apache.catalina.core.StandardService.initInternal(StandardService.java:)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:)
    at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:)
    at java.lang.reflect.Method.invoke(Method.java:)
    at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:)
Caused by: org.apache.catalina.LifecycleException: Protocol handler initialization failed
    at org.apache.catalina.connector.Connector.initInternal(Connector.java:)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:)
    ...  more
Caused by: java.lang.IllegalArgumentException: Alias name [null] does not identify a key entry
    at org.apache.tomcat.util.net.AbstractJsseEndpoint.createSSLContext(AbstractJsseEndpoint.java:)
    at org.apache.tomcat.util.net.AbstractJsseEndpoint.initialiseSsl(AbstractJsseEndpoint.java:)
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:)
    at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:)
    at org.apache.tomcat.util.net.AbstractJsseEndpoint.init(AbstractJsseEndpoint.java:)
    at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:)
    at org.apache.coyote.http11.AbstractHttp11Protocol.init(AbstractHttp11Protocol.java:)
    at org.apache.catalina.connector.Connector.initInternal(Connector.java:)
    ...  more
Caused by: java.io.IOException: Alias name [null] does not identify a key entry
    at org.apache.tomcat.util.net.jsse.JSSEUtil.getKeyManagers(JSSEUtil.java:)
    at org.apache.tomcat.util.net.AbstractJsseEndpoint.createSSLContext(AbstractJsseEndpoint.java:)
    ...  more

　　解决

　　重新生成秘钥，并且通过keytool -list -keystore thekeystore

检查秘钥的类型，是PrivateKeyEntry就正常了。

• PrivateKeyEntry，为私钥，配置在tomcat的server.xml（CAS服务端）
• trustedCertEntry，为公钥，配置在jdk（应用服务端）