Tomcat8.5配置https启动报空指针错误

tomcat8.5版本和tomcat8.0有了很大的区别，默认的server.xml中https的配置方式也有了变化：

<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol" SSLEnabled="true" secure="true" URIEncoding="UTF-8" useBodyEncodingForURI="true">
    <SSLHostConfig certificateVerification="optional">
        <Certificate certificateKeystoreFile="${catalina.home}/bin/mykey.jks" certificateKeystorePassword="mypassword"/>
    </SSLHostConfig>
</Connector>

然而当启动的时候，却报出了空指针错误：

02-Dec-2016 17:49:02.885 警告 [main] org.apache.tomcat.util.net.openssl.OpenSSLContext.init Error initializing SSL context
 java.lang.NullPointerException
    at org.apache.tomcat.util.net.openssl.OpenSSLContext.init(OpenSSLContext.java:281)
    at org.apache.tomcat.util.net.AbstractJsseEndpoint.createSSLContext(AbstractJsseEndpoint.java:101)
    at org.apache.tomcat.util.net.AbstractJsseEndpoint.initialiseSsl(AbstractJsseEndpoint.java:81)
    at org.apache.tomcat.util.net.NioEndpoint.bind(NioEndpoint.java:245)
    at org.apache.tomcat.util.net.AbstractEndpoint.init(AbstractEndpoint.java:875)
    at org.apache.tomcat.util.net.AbstractJsseEndpoint.init(AbstractJsseEndpoint.java:213)
    at org.apache.coyote.AbstractProtocol.init(AbstractProtocol.java:558)
    at org.apache.coyote.http11.AbstractHttp11Protocol.init(AbstractHttp11Protocol.java:65)
    at org.apache.catalina.connector.Connector.initInternal(Connector.java:968)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:107)
    at org.apache.catalina.core.StandardService.initInternal(StandardService.java:549)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:107)
    at org.apache.catalina.core.StandardServer.initInternal(StandardServer.java:875)
    at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:107)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:606)
    at org.apache.catalina.startup.Catalina.load(Catalina.java:629)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:311)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:494)

查源代码发现，tomcat8.5代码中要求有别名，如果没有配置，默认使用“tomcat”作为别名。显然，我们的证书别名不会是tomcat。

我们可以使用如下命令查看证书的别名：

keytool -list  -v -keystore xxxx.keystore -storepass 密码

比如：

D:	omcat	omcat858sin>keytool -list -v -keystore mykey.jks -storepass mypassword

密钥库类型: JKS
密钥库提供方: SUN

您的密钥库包含 1 个条目

别名: 1
创建日期: 2016-3-10
条目类型: PrivateKeyEntry
证书链长度: 3
证书[1]:
所有者: CN=*.guyezhai.com, O=XXXXXXXXXXXXXXXXXX, L=北京市, ST=北京市, C=CN
发布者: CN=WoSign Class 3 OV Server CA G2, O=WoSign CA Limited, C=CN
序列号: 567ab6b63782bdb9e44eba04dc27efe8
有效期开始日期: Thu Mar 10 17:19:17 CST 2016, 截止日期: Fri Mar 10 17:19:17 CST 2017
证书指纹:
         MD5: 72:67:7C:5A:4F:D8:5F:C7:D1:A2:71:53:C5:4A:EE:A3
         SHA1: F7:58:A7:4A:65:DD:B9:5F:51:37:91:33:06:C9:3E:29:3D:A7:3D:E2
         SHA256: 60:62:E0:70:7C:BD:BA:05:E8:87:28:33:8E:4D:2A:2B:5C:A7:30:D0:F0:7A:66:B6:D7:9D:B0:D7:27:65:BA:19
         签名算法名称: SHA256withRSA
         版本: 3

...

可以看到，此证书的别名是“1”，我们就可以在server.xml中配置别名了：

<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol" SSLEnabled="true" secure="true" URIEncoding="UTF-8" useBodyEncodingForURI="true">
    <SSLHostConfig certificateVerification="optional">
        <Certificate certificateKeystoreFile="${catalina.home}/bin/mykey.jks" certificateKeystorePassword="mypassword" certificateKeyAlias="1"/>
    </SSLHostConfig>
</Connector>

添加certificateKeyAlias="1"

然后再次启动tomcat，空指针报错就消失了。