Java LDAP 和 JNDI 的 ServiceUnavailableException
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原文地址: http://stackoverflow.com/questions/18630567/
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ServiceUnavailableException with LDAP and JNDI
提问by Hrvoje G.
I am using JNDI to connect to LDAP and I need it to work with many simultaneous TCP connections. All connections need to be established at the same time. The mystery is that sometimes it works and sometimes it establishes just some connections e.g. 17 of 30. I saw similar problems by googling but nobody provided their solution. Thanks! Stack trace:
我正在使用 JNDI 连接到 LDAP，我需要它与许多同时进行的 TCP 连接一起工作。所有连接都需要同时建立。神秘的是，有时它有效，有时它只建立一些连接，例如 30 个中的 17 个。我通过谷歌搜索看到了类似的问题，但没有人提供他们的解决方案。谢谢！堆栈跟踪：
javax.naming.ServiceUnavailableException: 172.16.0.xxx:389; socket closed
at com.sun.jndi.ldap.Connection.readReply(Connection.java:464)
at com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:370)
at com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:222)
at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2752)
at com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:328)
at com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:205)
at com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:223)
at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:166)
at com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.java:96)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:695)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:318)
at javax.naming.InitialContext.init(InitialContext.java:253)
at javax.naming.InitialContext.<init>(InitialContext.java:227)
at javax.naming.directory.InitialDirContext.<init>(InitialDirContext.java:112)
EDIT: some code
编辑：一些代码
socket = new Socket(hostname, port);
is = socket.getInputStream();
os = socket.getOutputStream();
bif = new BufferedInputStream(is);
bof = new BufferedOutputStream(os);
env = new Hashtable<String, String>();
env.put(Context.SECURITY_AUTHENTICATION, "simple");
env.put(Context.SECURITY_PRINCIPAL, usr);
env.put(Context.SECURITY_CREDENTIALS, pwd);
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.REFERRAL,"follow");
env.put("java.naming.ldap.derefAliases", "never");
env.put(Context.PROVIDER_URL, "ldap:// /*address*/);
try {
ctx = new InitialDirContext(env);//ERROR
} catch (ServiceUnavailableException e1) {
e1.printStackTrace();
System.out.println("service unavailable");
}
采纳答案by Hrvoje G.
Just to share that the problem was with limited file descriptors on ldap server and after raising the limit it works fine.
只是为了分享问题出在 ldap 服务器上的文件描述符有限，并且在提高限制后它工作正常。
