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Connection conn = ...;
Statement stat = conn.prepareCall(query);
state.execute();
...
resultSet.getMetaData();

com.ibm.db2.jcc.b.SqlException: [ibm][db2][jcc][10335][10366] Invalid
operation: Connection is closed.
at com.ibm.db2.jcc.b.bb.Nb(bb.java:3356)
at com.ibm.db2.jcc.b.bb.a(bb.java:1589)
at com.ibm.db2.jcc.b.bb.prepareStatement(bb.java:490) 

 statement = conn.prepareCall(query,
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);

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$ tar zxvf subversion-1.4.5.tar.gz
$ tar zxvf subversion-deps-1.4.5.tar.gz
$ cd  subversion-1.4.5
$ ./configure --prefix=/local/subversion-1.4.5-ssl --with-ssl
$ make
$ make install

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package com.demo.thread;

public class DemoThread {	
	public static void main(String[] args) {
		Object obj = new Object();
		
		Working worker1 = new Working("worker-1", obj, 2000);
		Working worker2 = new Working("worker-2", obj, 20);
		
		worker1.start();
		worker2.start();
	}
	
}

class Working extends Thread {
	private String mName;
	private Object mObj;
	private long mTime;
	
	public Working(String name, Object obj, long time) {
		mName = name;
		mObj = obj;
		mTime = time;
	}
	
	public void run() {
		while(true) {
			try {
				System.out.println(mName + " is waiting");
				Thread.sleep(mTime);
				System.out.println(mName + " is trying to enter critical region");
				synchronized(mObj) {
					System.out.println(mName + " has entered into critical region");
					System.out.println(mName + " will notify other thread");
					mObj.notify();
					System.out.println(mName + " will hang");
					mObj.wait();
					System.out.println(mName + " will quit critical region");
				}				
			} catch (InterruptedException e) {
				e.printStackTrace();
			}					
		}		
	}
	
}

worker-1 is waiting
worker-2 is waiting
worker-2 is trying to enter critical region
worker-2 has entered into critical region
worker-2 will notify other thread
worker-2 will hang
worker-1 is trying to enter critical region
worker-1 has entered into critical region
worker-1 will notify other thread
worker-1 will hang
worker-2 will quit critical region
worker-2 is waiting
worker-2 is trying to enter critical region
worker-2 has entered into critical region
worker-2 will notify other thread
worker-2 will hang
worker-1 will quit critical region
worker-1 is waiting
worker-1 is trying to enter critical region
worker-1 has entered into critical region
worker-1 will notify other thread
worker-1 will hang
worker-2 will quit critical region
worker-2 is waiting
worker-2 is trying to enter critical region
worker-2 has entered into critical region
worker-2 will notify other thread
worker-2 will hang
worker-1 will quit critical region
worker-1 is waiting
worker-1 is trying to enter critical region
worker-1 has entered into critical region
worker-1 will notify other thread
worker-1 will hang
worker-2 will quit critical region
worker-2 is waiting
worker-2 is trying to enter critical region
worker-2 has entered into critical region
worker-2 will notify other thread
worker-2 will hang
worker-1 will quit critical region
worker-1 is waiting
worker-1 is trying to enter critical region
worker-1 has entered into critical region
worker-1 will notify other thread
worker-1 will hang
worker-2 will quit critical region
worker-2 is waiting
worker-2 is trying to enter critical region
worker-2 has entered into critical region
worker-2 will notify other thread
worker-2 will hang
worker-1 will quit critical region
worker-1 is waiting
worker-1 is trying to enter critical region
worker-1 has entered into critical region
worker-1 will notify other thread
.....

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• 北京: 千橡集团暨校内网诚聘软件研发工程师
• 搜狐网站诚聘Java、PHP和C++工程师

• 搜狐网站诚聘Java、PHP和C++工程师
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public interface IClient {
    public void setHost(String host);
    public void setPort(int port);
    public void createClient();
    
    public List<IService> listServices();    
}

<?xml version='1.0' encoding='UTF-8'?>
<!-- Schema file written by PDE -->
<schema targetNamespace="com.example.services">
<annotation>
      <appInfo>
         <meta.schema plugin="com.example.services" id="clients" name="Clients"/>
      </appInfo>
      <documentation>
         this extension-point will be used to connect different container
      </documentation>
   </annotation>

   <element name="extension">
      <complexType>
         <sequence minOccurs="1" maxOccurs="unbounded">
            <element ref="client"/>
         </sequence>
         <attribute name="point" type="string" use="required">
            <annotation>
               <documentation>
                  
               </documentation>
            </annotation>
         </attribute>
         <attribute name="id" type="string">
            <annotation>
               <documentation>
                  
               </documentation>
            </annotation>
         </attribute>
         <attribute name="name" type="string">
            <annotation>
               <documentation>
                  
               </documentation>
               <appInfo>
                  <meta.attribute translatable="true"/>
               </appInfo>
            </annotation>
         </attribute>
      </complexType>
   </element>

   <element name="client">
      <complexType>
         <attribute name="id" type="string" use="required">
            <annotation>
               <documentation>
                  
               </documentation>
            </annotation>
         </attribute>
         <attribute name="name" type="string" use="required">
            <annotation>
               <documentation>
                  
               </documentation>
            </annotation>
         </attribute>
         <attribute name="clientType" type="string" use="required">
            <annotation>
               <documentation>
                  
               </documentation>
            </annotation>
         </attribute>
         <attribute name="class" type="string" use="required">
            <annotation>
               <documentation>
                  
               </documentation>
               <appInfo>
                  <meta.attribute kind="java" basedOn="com.example.services.client.IClient"/>
               </appInfo>
            </annotation>
         </attribute>
      </complexType>
   </element>

   <annotation>
      <appInfo>
         <meta.section type="since"/>
      </appInfo>
      <documentation>
         2007/09
      </documentation>
   </annotation>

   <annotation>
      <appInfo>
         <meta.section type="examples"/>
      </appInfo>
      <documentation>
         <pre>
<extension
         point="com.example.services.clients">
      <client
            class="com.example.services.TomcatClient"
            clientType="tomcat"
            id="com.example.services.TomcatClient"
            name="Tomcat Client"/>
</extension>
</pre>
      </documentation>
   </annotation>

   <annotation>
      <appInfo>
         <meta.section type="apiInfo"/>
      </appInfo>
      <documentation>
         extension of this extension-point must implement <samp>com.example.services.client.IClient</samp>
      </documentation>
   </annotation>

   <annotation>
      <appInfo>
         <meta.section type="implementation"/>
      </appInfo>
      <documentation>
         see com.example.services plugin for a implementation example
      </documentation>
   </annotation>

   <annotation>
      <appInfo>
         <meta.section type="copyright"/>
      </appInfo>
      <documentation>
         alexgreenbar
      </documentation>
   </annotation>

</schema>

//describe every client contribution
public class ClientsEntry {
    private final static String ATTR_TYPE = "clientType";
    private final static String ATTR_CLAZZ = "class";

    private IConfigurationElement element;
    
    private String type;

    public ClientsEntry(IConfigurationElement aElement) {
        element = aElement;
        
        type = element.getAttribute(ATTR_TYPE);
    }
 
    public String getType() {
        return type;
    }
    
    public IClient createClient() throws CoreException {
        return (IClient)element.createExecutableExtension(ATTR_CLAZZ);
    }

}

//ClientsRegistry manage all client contribution, use singleton pattern
public class ClientsRegistry {
    private final static Logger LOG = Logger.getLogger(ClientsRegistry.class.getName());
    
    private final static String EXTENSION_POINT_ID = "com.example.services.clients";
        
    private final static ClientsRegistry INSTANCE = new ClientsRegistry();
    
    private List<ClientsEntry> entries = new ArrayList<ClientsEntry>();
    
    private ClientsRegistry() {
        //
    }
    
    public static ClientsRegistry getInstance() {
        return INSTANCE;
    }
    
    private void load(){
        entries.clear();
        
        IExtensionRegistry registry = Platform.getExtensionRegistry();
        IExtensionPoint point = registry.getExtensionPoint(EXTENSION_POINT_ID);
        for (IExtension extension : point.getExtensions()){
            for (IConfigurationElement element : extension.getConfigurationElements()){
                entries.add(new ClientsEntry(element));
            }
        }
    }
    
    public List<ClientsEntry> getEntries() {
        load();
        return entries;
    }
    
    public IClient getClient(String type) {
        IClient client = null;
        
        load();
        for (ClientsEntry entry : entries) {
            if (entry.getType().equalsIgnoreCase(type)) {
                try {
                    client = entry.createClient();
                } catch (CoreException e) {
                    LOG.log(Level.FINE, "can't instance client extension: ", e);
                    client = null;
                    continue;
                }                
                break;                
            }            
        }

        return client;
    }

}

<extension
         point="com.example.services.clients">
      <client
            class="com.example.services.TomcatClient"
            clientType="tomcat"
            id="com.example.services.TomcatClient"
            name="Tomcat Client"/>
</extension>

String newClientType = "tomcat"
IClient client = ClientRegistry.getInstance().getClient(newClientType);
client.setHost("localhost");
client.setPort(8080);
client.createClient();
List<IService> allServices = client.listServices();

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public interface Ia<E> {
    public void add(E element);
    public E get();
}

public class A implements Ia {

    public void add(Object element) {
    }

    public Object get() {
        return null;
    }

}

public class A implements Ia<Object> {

    public void add(Object element) {
    }

    public Object get() {
        return null;
    }

}

public class A<F> implements Ia<F> {

    public void add(Object element) {
    }

    public F get() {
        return null;
    }

}

public class A<F> implements Ia<F> {

    public void add(F element) {
    }

    public F get() {
        return null;
    }

}

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public interface Ia<E> {
    public void add(E element);
    public E get();
}

public interface Ib<T> extends Ia<T> {
    public void myString();
}

public class B<F> implements Ib<F>{

    public void myString() {

    }

    public void add(F element) {

    }

    public F get() {
        return null;
    }

    public static void main(String[] args) {
        B<String> myB = new B<String>();
        myB.toString();
    }

}

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