java - Tomcat JNDI 资源不可访问

Question

我已经浏览了关于上述主题的所有帖子，但未能解决这个问题。情况是这样的:

1)我在Tomcat 8.0.20的conf/server.xml(GlobalNamingResources)中定义了一组资源2) 我已经在 tomcat conf/context.xml 中声明了 ResourceLink3) 从 Web 应用程序中我得到名称未绑定(bind)异常。

根据我的理解，如果 server.xml 中声明的资源被映射到 ResourceLink 中，则可以从上下文访问它，现在 conf/context.xml 已为所有 Web 应用程序加载并且资源应该可用但是他们不是。我错过了什么吗？

以下是文件:

异常

javax.naming.NameNotFoundException: Name [comp/env] is not bound in this   Context
. Unable to find [comp].
    at org.apache.naming.NamingContext.lookup(NamingContext.java:818)
    at org.apache.naming.NamingContext.lookup(NamingContext.java:166)
    at org.apache.naming.SelectorContext.lookup(SelectorContext.java:157)
    at javax.naming.InitialContext.lookup(InitialContext.java:417)
    at com.hm.vigil.platform.db.DatabaseConnectionManager.<init>(DatabaseConnectionManager.java:40)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

服务器.xml

    <Server port="8005" shutdown="SHUTDOWN">
    <Listener className="org.apache.catalina.startup.VersionLoggerListener" />
    <!-- Security listener. Documentation at /docs/config/listeners.html
    <Listener className="org.apache.catalina.security.SecurityListener" />
    -->
    <!--APR library loader. Documentation at /docs/apr.html -->
    <Listener className="org.apache.catalina.core.AprLifecycleListener"   SSLEngine="on" />
  <!-- Prevent memory leaks due to use of particular java/javax APIs-->
  <Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
  <Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />

  <!-- Global JNDI resources
       Documentation at /docs/jndi-resources-howto.html
  -->
        <GlobalNamingResources>
    <!-- Editable user database that can also be used by
         UserDatabaseRealm to authenticate users
    -->
    <Resource name="UserDatabase" auth="Container"
              type="org.apache.catalina.UserDatabase"
              description="User database that can be updated and saved"
              factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
              pathname="conf/tomcat-users.xml" />

        <Resource name="pool/LDAP"
                  auth="Container"
                  type="com.hm.vigil.platform.ldap.LDAPConnectionManager"
                  factory="com.hm.vigil.platform.ldap.LDAPConnectionManager"
                  singleton="true"
                  closeMethod="closeLDAPConnectionManager"/>

        <Resource name="platform/ZOOKEEPER"
                  auth="Container"
                  type="com.hm.vigil.platform.config.PlatformConfigManager"
                  factory="com.hm.vigil.platform.config.PlatformConfigManager"
                  singleton="true"
                  closeMethod="closeZookeeperConfigRetriever"/>

        <Resource name="pool/DB_CLIENT"
                  auth="Container"
                  type="javax.sql.Datasource"
                  factory="com.hm.vigil.platform.db.DatabaseConnectionManager"
                  singleton="true"
                  closeMethod="closeDatabaseConnectionManager"/>

        <Resource name="platform/client/CONFIG_MANAGER"
                  auth="Container"
                  type="com.hm.vigil.platform.config.ClientConfigManager"
                  factory="com.hm.vigil.platform.config.ClientConfigManager"
                  singleton="true"
                  closeMethod="closeClientConfigManager"/>

        <Environment name="zooKeeperHost" 
                     type="java.lang.String" 
                     value="localhost" 
                     override="false"/>   

        <Environment name="zookeeperPort" 
                     type="java.lang.String" 
                     value="2181" 
                     override="false"/>                                                       

  </GlobalNamingResources>

  <!-- A "Service" is a collection of one or more "Connectors" that share
       a single "Container" Note:  A "Service" is not itself a "Container",
       so you may not define subcomponents such as "Valves" at this level.
       Documentation at /docs/config/service.html
   -->
  <Service name="Catalina">

    <!--The connectors can use a shared executor, you can define one or more named thread pools-->
    <!--
    <Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
        maxThreads="150" minSpareThreads="4"/>
    -->


    <!-- A "Connector" represents an endpoint by which requests are received
         and responses are returned. Documentation at :
         Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
         Java AJP  Connector: /docs/config/ajp.html
         APR (HTTP/AJP) Connector: /docs/apr.html
         Define a non-SSL/TLS HTTP/1.1 Connector on port 8080
    -->
    <Connector port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
    <!-- A "Connector" using the shared thread pool-->
    <!--
    <Connector executor="tomcatThreadPool"
               port="8080" protocol="HTTP/1.1"
               connectionTimeout="20000"
               redirectPort="8443" />
    -->
    <!-- Define a SSL/TLS HTTP/1.1 Connector on port 8443
         This connector uses the NIO implementation that requires the JSSE
         style configuration. When using the APR/native implementation, the
         OpenSSL style configuration is required as described in the APR/native
         documentation -->
    <!--
    <Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol"
               maxThreads="150" SSLEnabled="true" scheme="https" secure="true"
               clientAuth="false" sslProtocol="TLS" />
    -->

    <!-- Define an AJP 1.3 Connector on port 8009 -->
    <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />


    <!-- An Engine represents the entry point (within Catalina) that processes
         every request.  The Engine implementation for Tomcat stand alone
         analyzes the HTTP headers included with the request, and passes them
         on to the appropriate Host (virtual host).
         Documentation at /docs/config/engine.html -->

    <!-- You should set jvmRoute to support load-balancing via AJP ie :
    <Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
    -->
    <Engine name="Catalina" defaultHost="localhost">

      <!--For clustering, please take a look at documentation at:
          /docs/cluster-howto.html  (simple how to)
          /docs/config/cluster.html (reference documentation) -->

      <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>


      <!-- Use the LockOutRealm to prevent attempts to guess user passwords
           via a brute-force attack -->
      <Realm className="org.apache.catalina.realm.LockOutRealm">
        <!-- This Realm uses the UserDatabase configured in the global JNDI
             resources under the key "UserDatabase".  Any edits
             that are performed against this UserDatabase are immediately
             available for use by the Realm.  -->
        <!-- <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
               resourceName="UserDatabase"/> -->

         <Realm className="org.apache.catalina.realm.JNDIRealm"
                connectionURL="ldap://localhost:10389"
                connectionName="uid=admin,ou=system"
                connectionPassword="secret"
                userBase="cn=PLATFORM_CLIENTS,cn=PLATFORM_CONFIG,dc=example,dc=com"
                userSubtree="true"
                userSearch="(&amp;(objectClass=user)(email={0})(userClass=ACTIVE))"
                userRoleName="userRole"/>

      </Realm>

      <Host name="localhost"  appBase="webapps"
            unpackWARs="true" autoDeploy="true">

        <!-- SingleSignOn valve, share authentication between web applications
             Documentation at: /docs/config/valve.html -->

        <!-- <Valve className="org.apache.catalina.authenticator.SingleSignOn" /> -->
        <Valve className="org.apache.catalina.ha.authenticator.ClusterSingleSignOn" />
        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html
             Note: The pattern used is equivalent to using pattern="common" -->
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log" suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />

<!--          <Context>
            <Environment name="zooKeeperHost" 
                     type="java.lang.String" 
                     value="localhost" 
                     override="false"/>

            <Environment name="zookeeperPort" 
                     type="java.lang.String" 
                     value="2181" 
                     override="false"/>
         </Context> -->

      </Host>
    </Engine>
  </Service>
</Server>

context.xml

    <Context>

    <!-- Default set of monitored resources. If one of these changes, the    -->
    <!-- web application will be reloaded.                                   -->
    <WatchedResource>WEB-INF/web.xml</WatchedResource>
    <WatchedResource>${catalina.base}/conf/web.xml</WatchedResource>

<!--        <Environment name="zooKeeperHost" 
                     type="java.lang.String" 
                     value="localhost" 
                     override="false"/> -->

        <ResourceLink name="zooKeeperHost"
                      global="zooKeeperHost"
                      type="java.lang.String"/>                  

<!--        <Environment name="zookeeperPort" 
                     type="java.lang.String" 
                     value="2181" 
                     override="false"/> -->

        <ResourceLink name="zookeeperPort"
                      global="zookeeperPort"
                      type="java.lang.String"/>

<!--         <Resource name="pool/LDAP"
                  auth="Container"
                  type="com.hm.vigil.platform.ldap.LDAPConnectionManager"
                  factory="com.hm.vigil.platform.ldap.LDAPConnectionManager"
                  singleton="true"
                  closeMethod="closeLDAPConnectionManager"/> -->

        <ResourceLink name="pool/LDAP"
                      global="pool/LDAP"
                      type="com.hm.vigil.platform.ldap.LDAPConnectionManager"/>

<!--          <Resource name="platform/ZOOKEEPER"
                  auth="Container"
                  type="com.hm.vigil.platform.config.PlatformConfigManager"
                  factory="com.hm.vigil.platform.config.PlatformConfigManager"
                  singleton="true"
                  closeMethod="closeZookeeperConfigRetriever"/> -->

        <ResourceLink name="platform/ZOOKEEPER"
                      global="platform/ZOOKEEPER"
                      type="com.hm.vigil.platform.config.ZookeeperConfigRetriever"/>

<!--         <Resource name="pool/DB_CLIENT"
                  auth="Container"
                  type="javax.sql.Datasource"
                  factory="com.hm.vigil.platform.db.DatabaseConnectionManager"
                  singleton="true"
                  closeMethod="closeDatabaseConnectionManager"/> -->

        <ResourceLink name="pool/DB_CLIENT"
                      global="pool/DB_CLIENT"
                      type="javax.sql.Datasource"/>

<!--         <Resource name="platform/client/CONFIG_MANAGER"
                  auth="Container"
                  type="com.hm.vigil.platform.config.ClientConfigManager"
                  factory="com.hm.vigil.platform.config.ClientConfigManager"
                  singleton="true"
                  closeMethod="closeClientConfigManager"/> -->

        <ResourceLink name="platform/client/CONFIG_MANAGER"
                      global="platform/client/CONFIG_MANAGER"
                      type="com.hm.vigil.platform.config.ClientConfigManager"/>                                                           

    <!-- Uncomment this to disable session persistence across Tomcat restarts -->

    <Manager pathname="" />

    <!-- Uncomment this to enable Comet connection tacking (provides events
         on session expiration as well as webapp lifecycle) -->
    <!--
    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
    -->

</Context>

谢谢

Answer 1

我将发布我对上述问题的发现。

问题是一个/多个资源具有对绑定(bind)到 JNDI 树的另一个资源的内部引用。因此，在创建资源期间，其他资源会尝试解析公共(public)资源的 JNDI 树。现在，在加载上下文时，该上下文的 JNDI 树实际上并不存在，因此出现上述错误。

解决方法是在公共(public)资源上声明一个工厂方法，并通过工厂方法从其他资源获取对公共(public)资源的引用。

因此，作为一般原则，我认为资源不能从 JNDI 解析其他资源。