Examples of javax.naming.CommunicationException

javax.naming.CommunicationException
This exception is thrown when the client is unable to communicate with the directory or naming service. The inability to communicate with the service might be a result of many factors, such as network partitioning, hardware or interface problems, failures on either the client or server side. This exception is meant to be used to capture such communication problems.
Synchronization and serialization issues that apply to NamingException apply directly here. @author Rosanna Lee @author Scott Seligman @since 1.3


        LdapMessage message = null;
        try {
            message = client.doOperation(op, requestControls);
        } catch (IOException e) {
            CommunicationException ex = new CommunicationException(e
                    .getMessage());
            ex.setRootCause(e);
            if (op.getSearchResult() == null || op.getSearchResult().isEmpty()) {
                throw ex;
            }
            op.getSearchResult().setException(ex);
            // occurs errors, just return, doesn't deal with referral and

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                client = LdapClient.newInstance(address, port, env);
                try {
                    doBindOperation(connCtls);
                } catch (IOException e) {
                    CommunicationException ex = new CommunicationException();
                    ex.setRootCause(e);
                    throw ex;
                }
            } else {


                reconnect(connCtls);

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    protected void doBasicOperation(LdapOperation op) throws NamingException {
        LdapMessage message = null;
        try {
            message = client.doOperation(op, requestControls);
        } catch (IOException e) {
            CommunicationException ex = new CommunicationException();
            ex.setRootCause(e);
            // operation failed, clear responseControls
            responseControls = null;
            throw ex;
        }

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        });


        try {
            return client.addPersistentSearch(op);
        } catch (IOException e) {
            CommunicationException ex = new CommunicationException();
            ex.setRootCause(e);
            throw ex;
        }
    }

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        try {
            for (Integer id : idList) {
                client.removePersistentSearch(id.intValue(), requestControls);
            }
        } catch (IOException e) {
            CommunicationException ex = new CommunicationException();
            ex.setRootCause(e);
        }
    }

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        initial(client, environment, dn);


        try {
            doBindOperation(connCtls);
        } catch (IOException e) {
            CommunicationException ex = new CommunicationException();
            ex.setRootCause(e);
            throw ex;
        }
    }

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    public void reconnect(Control[] ac) throws NamingException {
        connCtls = ac;
        try {
            doBindOperation(connCtls);
        } catch (IOException e) {
            CommunicationException ex = new CommunicationException();
            ex.setRootCause(e);
            throw ex;
        }
    }

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            search = new SearchOp("", searchControls, filter);


            try {
                client.doOperation(search, requestControls);
            } catch (IOException e) {
                CommunicationException ex = new CommunicationException(e
                        .getMessage());
                ex.setRootCause(e);
                if (search.getSearchResult().isEmpty()) {
                    throw ex;
                }
                search.getSearchResult().setException(ex);
            }


            sre = search.getSearchResult();
            names = sre.getEntries();


            keyset = names.keySet();
            schemaRoot: for (Iterator<String> iterator = keyset.iterator(); iterator
                    .hasNext();) {
                String key = iterator.next();
                Attributes as = names.get(key);
                NamingEnumeration<String> ids = as.getIDs();
                while (ids.hasMore()) {
                    String id = ids.next();
                    if (id.equalsIgnoreCase("subschemasubentry")) {
                        subschemasubentry = (String) as.get(id).get();
                        break schemaRoot;
                    }
                }
            }
        }


        searchControls.setSearchScope(SearchControls.OBJECT_SCOPE);
        searchControls.setReturningAttributes(new String[] { "objectclasses",
                "attributetypes", "matchingrules", "ldapsyntaxes" });
        searchControls.setReturningObjFlag(true);
        filterParser = new FilterParser("(objectClass=subschema)");
        try {
            filter = filterParser.parse();
        } catch (ParseException e) {
            InvalidSearchFilterException ex = new InvalidSearchFilterException(
                    Messages.getString("ldap.29")); //$NON-NLS-1$
            ex.setRootCause(e);
            throw ex;
        }
        search = new SearchOp(subschemasubentry, searchControls, filter);


        try {
            client.doOperation(search, requestControls);
        } catch (IOException e) {
            CommunicationException ex = new CommunicationException(e
                    .getMessage());
            ex.setRootCause(e);
            if (search.getSearchResult().isEmpty()) {
                throw ex;
            }
            search.getSearchResult().setException(ex);
        }

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        String n = "urn:eda:rmi:" + (String) i.next();
        org.apache.oodt.commons.Service server = (org.apache.oodt.commons.Service) lookup(n);
        try {
          return new NameClassPair(n, server.getServerInterfaceName());
        } catch (RemoteException ex) {
          throw new CommunicationException(ex.getMessage());
        }
      }
      public boolean hasMoreElements() {
        return hasMore();
      }

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        try {
            namespace = createNamespace(_provider.getNameParser());
        } catch (NamingException exception) {
            throw exception;
        } catch (Exception exception) {
            throw new CommunicationException(exception.toString());
        }


        environment.put(RemoteContext.NAMING_PROVIDER, _provider);
        environment.put(RemoteContext.NAMESPACE, namespace);

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