我编写了一个自定义 tomcat 阀门来解析 HTTP 标头并使用它们进行身份验证。Valve 通过扩展 AuthenticatorBase 来工作。我编译它并将它放在 $CATALINA_HOME/lib 中。这是代码：
public class TomcatLogin extends AuthenticatorBase {
private String[] roleNames = null;
private String ivcreds = null;
private String ivuser = null;
private String ivgroups = null;
private GenericPrincipal principal = null;
// Constructor defers to super class (Authenticator base)
public TomcatLogin(){
super();
}
protected boolean doAuthenticate(Request request, HttpServletResponse response)
{
List<String> groupsList = null;
System.out.println("Obtaining Headers from Request");
try {
ivuser = request.getHeader("iv-user");
ivcreds = request.getHeader("iv-creds");
ivgroups = request.getHeader("iv-groups");
} catch(Exception e) {
e.printStackTrace();
}
// Require all header credentials for proper authentication
if(ivuser == null || ivcreds == null || ivgroups == null)
return false;
// Split ivgroups by comma seporated value
// Then remove head and tail quotation marks
roleNames = ivgroups.split(",");
for(int i=0; i<roleNames.length; i++){
roleNames[i] = roleNames[i].substring(1, roleNames[i].length()-1 );
groupsList.add(roleNames[i]);
}
principal = new GenericPrincipal(ivuser, ivcreds, groupsList);
request.setUserPrincipal(principal);
return true;
}
public String getAuthMethod() {
return "HTTPAuthenticator";
}
}
然后我告诉 Tomcat 使用 server.xml 中的阀门。扩展 AuthenticatorBase的文档说，当使用此类时，它所附加的上下文（或层次结构中的父容器）必须具有关联的领域，可用于验证用户并枚举他们已分配的角色. 我以为我已经正确配置了它，但是它抛出错误并且 Tomcat 无法启动。这是server.xml配置：
<?xml version="1.0" encoding="UTF-8"?>
...
<Server>
<Service name="Catalina">
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.LockOutRealm">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
</Realm>
<!-- Here is my valve -->
<Valve className="package.of.my.custom.valve.TomcatLogin" />
<Host ... >
...
</Host>
</Engine>
</Service>
</Server>
这是我收到的错误消息：
10-Jan-2019 10:11:03.576 SEVERE [main] org.apache.tomcat.util.digester.Digester.endElement End event threw exception
java.lang.reflect.InvocationTargetException
... A bunch of useless stacktrace
Caused by: java.lang.IllegalArgumentException: Configuration error: Must be attached to a Context at org.apache.catalina.authenticator.AuthenticatorBase.setContainer(AuthenticatorBase.java:278)
at org.apache.catalina.core.StandardPipeline.addValve(StandardPipeline.java:335)
at org.apache.catalina.core.ContainerBase.addValve(ContainerBase.java:1133)
... 27 more
10-Jan-2019 10:11:03.579 WARNING [main] org.apache.catalina.startup.Catalina.load Catalina.start using conf/server.xml: Error at (107, 82) : Configuration error: Must be attached to a Context
10-Jan-2019 10:11:03.579 SEVERE [main] org.apache.catalina.startup.Catalina.start Cannot start server. Server instance is not configured.
我认为我的阀门写得正确，所以我的猜测是问题出在配置中。不知道为什么它没有获得附加的上下文。有任何想法吗？
编辑：
我尝试将阀门放入我的应用程序中META-INF/context.xml（我必须制作一个，因为一开始没有一个）。这里是：
<?xml version="1.0"?>
<Context>
<Valve className="package.of.my.custom.valve.TomcatLogin" />
</Context>
服务器随后启动，但无法部署任何应用程序。我收到了与我最初尝试在此自定义实现中使用的 IBM 阀门类似的错误，但它无法AuthenticatorBase从catalina.jar. 以下是SEVERE我得到的错误：
10-Jan-2019 15:34:06.673 SEVERE [main] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/sample-DB]]
...
Stacktrace info
...
at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:441)
Caused by: java.lang.ExceptionInInitializerError
at org.apache.tomcat.util.digester.Digester.startDocument(Digester.java:1102)
Caused by: java.lang.NullPointerException
at java.nio.charset.Charset.put(Charset.java:538)
...
Stacktrace
...
10-Jan-2019 15:34:06.688 INFO [main] org.apache.catalina.startup.HostConfig.deployWAR Deployment of web application archive [/fmac/deploy/sample.war] has finished in [11] ms
10-Jan-2019 15:34:06.689 INFO [main] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive [/fmac/deploy/sample-auth.war]
10-Jan-2019 15:34:06.692 SEVERE [main] org.apache.tomcat.util.digester.Digester.startElement Begin event threw error
java.lang.NoClassDefFoundError: org/apache/catalina/authenticator/AuthenticatorBase
...
Stacktrace
The Error Below is the most confusing one. How can it not find this class?
...
Caused by: java.lang.ClassNotFoundException: org.apache.catalina.authenticator.AuthenticatorBase
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
...
Stacktrace
...
10-Jan-2019 15:34:13.823 SEVERE [https-jsse-nio2-8443-exec-3] org.apache.coyote.http11.Http11Processor.service Error processing request
java.lang.NoClassDefFoundError: Could not initialize class
org.apache.tomcat.util.buf.B2CConverter
at org.apache.catalina.connector.CoyoteAdapter.convertURI(CoyoteAdapter.java:1072)