Tomcat8.5配置https啓動報空指針錯誤

tomcat8.5版本和tomcat8.0有了很大的區別，默認的server.xml中https的配置方式也有了變化：

<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>

然而當啓動的時候，卻報出了空指針錯誤：

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)

查源代碼發現，tomcat8.5代碼中要求有別名，若是沒有配置，默認使用「tomcat」做爲別名。顯然，咱們的證書別名不會是tomcat。

咱們能夠使用以下命令查看證書的別名：

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

好比：

D:\tomcat\tomcat858s\bin>keytool -list -v -keystore mykey.jks -storepass mypassword

密鑰庫類型: JKS
密鑰庫提供方: SUN

您的密鑰庫包含 1 個條目

別名: 1
建立日期: 2016-3-10
條目類型: PrivateKeyEntry
證書鏈長度: 3
證書[1]:
全部者: CN=*.guyezhai.com, O=XXXXXXXXXXXXXXXXXX, L=北京市, ST=北京市, C=CN
發佈者: CN=WoSign Class 3 OV Server CA G2, O=WoSign CA Limited, C=CN
序列號: 567ab6b63782bdb9e44eba04dc27efe8
有效期開始日期: Thu Mar 10 17:19:17 CST 2016, 截止日期: Fri Mar 10 17:19:17 CST 2017
證書指紋:
         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
         簽名算法名稱: SHA256withRSA
         版本: 3

...

能夠看到，此證書的別名是「1」，咱們就能夠在server.xml中配置別名了：

<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"

而後再次啓動tomcat，空指針報錯就消失了。