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Object obj = null;
try {
	obj = pool.borrowObject();
	//...use the object...
} catch(Exception e) {
	//...handle any exceptions...
} finally {
	// make sure the object is returned to the pool
	if(null != obj) {
	pool.returnObject(obj);
}

Object obj = null;
Object key = "Key";
try {
	obj = pool.borrowObject(key);
	//...use the object...
} catch(Exception e) {
	//...handle any exceptions...
} finally {
	// make sure the object is returned to the pool
	if(null != obj) {
		pool.returnObject(key,obj);
	}
}

import java.io.Reader;
import java.io.IOException;
public class ReaderUtil {
public ReaderUtil() {
}
/**
* Dumps the contents of the {@link Reader} to a
* String, closing the {@link Reader} when done.
*/
public String readToString(Reader in) throws IOException {
	StringBuffer buf = new StringBuffer();
try {
	for( int c = in.read(); c != -1; c = in.read()) {
		buf.append((char)c);
	}
	return buf.toString();
} catch(IOException e) {
	throw e;
} finally {
	try {
		in.close();
	} catch (Exception e) {
		// ignored
	}
}
}

import org.apache.commons.pool.ObjectPool;
import java.io.Reader;
import java.io.IOException;
public class ReaderUtil {
	private ObjectPool pool;
	public ReaderUtil(ObjectPool pool) {
	this.pool = pool;
}
/**
* Dumps the contents of the {@link Reader} to a
* String, closing the {@link Reader} when done.
*/
public String readToString(Reader in) throws IOException {
StringBuffer buf = null;
try {
	buf = (StringBuffer)(pool.borrowObject());
	for(int c = in.read(); c != -1; c = in.read()) {
		buf.append((char)c);
	return buf.toString();
} catch(IOException e) {
	throw e;
} catch(Exception e) {
	throw new RuntimeException("Unable to borrow buffer from pool" +
	e.toString());
} finally {
	try {
		in.close();
	} catch(Exception e) {
		// ignored
	}
	try {
		if(null != buf) {
			pool.returnObject(buf);
		}
	} catch(Exception e) {
		// ignored
	}
}
}

import org.apache.commons.pool.BasePoolableObjectFactory;
public class StringBufferFactory extends BasePoolableObjectFactory {
	// for makeObject we'll simply return a new buffer
	public Object makeObject() {
		return new StringBuffer();
	}
	// when an object is returned to the pool,
	// we'll clear it out
	public void passivateObject(Object obj) {
		StringBuffer buf = (StringBuffer)obj;
		buf.setLength(0);
	}
	// for all other methods, the no-op
	// implementation in BasePoolableObjectFactory
	// will suffice
}

new ReaderUtil(new StackObjectPool(new StringBufferFactory()))