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A Java Optimization Framework
There is a newer version: 4.6.0
package soot.jimple.toolkits.pointer.nativemethods;

/*-
 * #%L
 * Soot - a J*va Optimization Framework
 * %%
 * Copyright (C) 2003 Feng Qian
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 2.1 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import soot.SootMethod;
import soot.jimple.toolkits.pointer.representations.ReferenceVariable;
import soot.jimple.toolkits.pointer.util.NativeHelper;

public class JavaLangReflectFieldNative extends NativeMethodClass {
  public JavaLangReflectFieldNative(NativeHelper helper) {
    super(helper);
  }

  /**
   * Implements the abstract method simulateMethod. It distributes the request to the corresponding methods by signatures.
   */
  public void simulateMethod(SootMethod method, ReferenceVariable thisVar, ReferenceVariable returnVar,
      ReferenceVariable params[]) {

    String subSignature = method.getSubSignature();

    if (subSignature.equals("void set(java.lang.Object,java.lang.Object)")) {
      java_lang_reflect_Field_set(method, thisVar, returnVar, params);
      return;

    } else if (subSignature.equals("java.lang.Object get(java.lang.Object)")) {
      java_lang_reflect_Field_get(method, thisVar, returnVar, params);
      return;

    } else {
      defaultMethod(method, thisVar, returnVar, params);
      return;

    }
  }

  /*********************** java.lang.reflect.Field *********************/
  /**
   * NOTE: make all fields pointing to @param1
   *
   * public native void set(java.lang.Object, java.lang.Object) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   */
  public void java_lang_reflect_Field_set(SootMethod method, ReferenceVariable thisVar, ReferenceVariable returnVar,
      ReferenceVariable params[]) {
    /* Warn the user that reflection may not be handle correctly. */
    throw new NativeMethodNotSupportedException(method);
  }

  /**
   * Returns the value of the field represented by this Field, on the specified object. The value is automatically wrapped in
   * an object if it has a primitive type.
   *
   * NOTE: this really needs precise info of @this (its name). conservative way, makes return value possibly point to
   * universal objects.
   *
   * public native java.lang.Object get(java.lang.Object) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   */
  public void java_lang_reflect_Field_get(SootMethod method, ReferenceVariable thisVar, ReferenceVariable returnVar,
      ReferenceVariable params[]) {
    throw new NativeMethodNotSupportedException(method);
  }

  /**
   * All other native methods in this class has no side effects.
   *
   * public native boolean getBoolean(java.lang.Object) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native byte getByte(java.lang.Object) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native char getChar(java.lang.Object) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native short getShort(java.lang.Object) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native int getInt(java.lang.Object) throws java.lang.IllegalArgumentException, java.lang.IllegalAccessException;
   *
   * public native long getLong(java.lang.Object) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native float getFloat(java.lang.Object) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native double getDouble(java.lang.Object) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native void setBoolean(java.lang.Object, boolean) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native void setByte(java.lang.Object, byte) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native void setChar(java.lang.Object, char) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native void setShort(java.lang.Object, short) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native void setInt(java.lang.Object, int) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native void setLong(java.lang.Object, long) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native void setFloat(java.lang.Object, float) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * public native void setDouble(java.lang.Object, double) throws java.lang.IllegalArgumentException,
   * java.lang.IllegalAccessException;
   *
   * @see default(...)
   */
}