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This is a Java interface to Tobi Oetikers rrdtool. It is pure java but it requires the rrdtool binary to do its job.
The newest version!

/*

 Copyright (c) 2010 by Peter Stamfest 

 This file is part of java-rrd.

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.

 Except as contained in this notice, the name of Peter Stamfest shall not 
 be used in advertising or otherwise to promote the sale, use or other 
 dealings in this Software without prior written authorization from 
 Peter Stamfest.

*/


package net.stamfest.rrd;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.Arrays;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RRDp implements RRDCommand {
	public static final int SOCKET_TIMEOUT = 10000;
	static private Logger logger = Logger.getLogger(RRDp.class.getName());
	Process rrdtool = null;
	Socket socket = null;

	private OutputStream writer;
	private InputStream reader;

	public RRDp(String basedir, String cachedAddress) throws IOException {
		String cmd[] = new String[] { "rrdtool", "-", basedir };

		ProcessBuilder pb = new ProcessBuilder(cmd);
		if (cachedAddress != null) {
			pb.environment().put("RRDCACHED_ADDRESS", cachedAddress);
		}

		rrdtool = pb.start();

		InputStream r = rrdtool.getInputStream();
		reader = r;
		writer = rrdtool.getOutputStream();
	}

	public RRDp(String host, int port) throws IOException {
		socket = new Socket();
		socket.connect(new InetSocketAddress(host, port), SOCKET_TIMEOUT);
		socket.setSoTimeout(SOCKET_TIMEOUT);

		reader = socket.getInputStream();
		writer = socket.getOutputStream();
	}

	// OK u:0.00 s:0.00 r:17.20
	static private Pattern okpat   = Pattern.compile("^OK u:([0-9.]+) s:([0-9.]+) r:([0-9.]+)"); 
	static private Pattern infoPat = Pattern.compile("^\\s*(.*?)\\s*=\\s*(.*?)\\s*$");
	protected synchronized CommandResult sendCommand(String command[]) throws Exception {
		if (rrdtool == null && socket == null) {
			throw new Exception("No subprocess available (already closed?)");
		}

		if (command == null || command.length == 0) {
			throw new IllegalArgumentException();
		}

		if (command[0].equals("graph")) {
			throw new Exception("Use graphv instead"); 
		}

		StringBuffer sb = new StringBuffer();
		for (String c: command) {
			if (sb.length() > 0) sb.append(' ');
			sb.append(c);
		}
		sb.append('\n');

		if (logger.isLoggable(Level.FINER)) {
			logger.finer(sb.toString());
		}

		try {
			writer.write(sb.toString().getBytes());
			writer.flush();
		} catch (IOException io) {
			finish();
			throw io;
		}

		String line = null;

		CommandResult r = new CommandResult();
		sb.setLength(0);
		HashMap data = null;
		Matcher m;
		int replyLines = 0;

		while (true) {
			try {
				line = readLine();
				if (line == null) break;
			} catch (IOException e) {
				finish();
				throw new Exception("Protocol error: timeout?");
			}
			replyLines++;
			if (line.startsWith("ERROR")) {
				r.ok = false;
				r.error = line;
				break;
			}
			if (line.startsWith("OK ")) {
				m = okpat.matcher(line);

				if (m.find()) {
					r.user = Float.parseFloat(m.group(1));
					r.system = Float.parseFloat(m.group(2));
					r.total= Float.parseFloat(m.group(3));
					r.ok = true;
					break;
				}
			}

			m = infoPat.matcher(line);
			if (m.find()) {
				if (data == null) data = new HashMap();

				String k = m.group(1);
				String v = m.group(2);

				if (k.equals("image") && v.startsWith("BLOB_SIZE:")) {
					int len = Integer.parseInt(v.substring(10));

					//    System.err.println("BLOB " + len);
					byte img[] = new byte[len];
					int pos = 0;
					while (pos != len) {
						int n = reader.read(img, pos, len - pos);
						if (n <= 0) throw new Exception("protocol error");
						pos += n;
					}
					r.image = img;
				}

				data.put(k, v);
				if (logger.isLoggable(Level.FINEST)) {
					logger.finest(String.format("put info: %s=%s", k, v));
				}
				continue;
			}

			sb.append(line).append("\n");
		}
		
		if (line == null) {
			finish();

			if (replyLines == 0) {
				// EOF without ANY response
				throw new Exception("Protocol error: No reply (EOF)");
			}
			throw new Exception("Protocol error: short reply (EOF)");
		}
		
		r.output = sb.toString();
		r.info = data;

		if (logger.isLoggable(Level.FINEST)) {
			logger.finest(r.toString());
		}

		if (logger.isLoggable(Level.FINER)) {
			logger.finer(r.ok + ":" + r.error);
		}

		return r;
	}

	private String readLine() throws IOException {
		int c;
		byte b[] = new byte[128];
		int pos = 0;

		while (true) {
			c = reader.read();
			if (c == -1 || c == '\n') break;
			if (pos == b.length) {
				b = Arrays.copyOf(b, b.length * 2);
			}
			b[pos++] = (byte) c;
		}

		if (c == -1 && pos == 0) return null;

		return new String(b, 0, pos);
	}

	public void finish() {
		if (rrdtool != null || socket != null) {
			try {
				if (socket != null) socket.close();
				writer.close();
				reader.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			rrdtool = null;
			socket = null;
			writer = null;
			reader = null;
		}
	}

	@Override
	protected void finalize() throws Throwable {
		super.finalize();
		finish();
	}

	public CommandResult command(String cmd[]) throws Exception {
		try {
			return sendCommand(cmd);
		} catch (Exception e) {
			if (rrdtool == null) throw e;
			InputStream error = rrdtool.getErrorStream();

			boolean collect = logger.isLoggable(Level.INFO);
			if (collect) {
				byte buf[] = new byte[1024];
				StringBuffer sb = new StringBuffer();
				while (error.available() > 0) {
					int n = error.read(buf);
					sb.append(new String(buf, 0, n));
				}

				logger.info(sb.toString());
			}
			throw e;
		}
	}

}