diff --git a/infer/models/java/src/java/lang/Process.java b/infer/models/java/src/java/lang/Process.java
index 2892a6b88..5034a6d3b 100644
--- a/infer/models/java/src/java/lang/Process.java
+++ b/infer/models/java/src/java/lang/Process.java
@@ -9,84 +9,24 @@
 
 package java.lang;
 
+import com.facebook.infer.builtins.InferBuiltins;
 import com.facebook.infer.builtins.InferUndefined;
 
-import java.io.*;
+import java.io.FileDescriptor;
 
 public abstract class Process {
 
-  protected final int pid;
-  protected final InputStream inputStream;
-  protected final OutputStream outputStream;
-  protected final InputStream errorStream;
-
   public Process(int pid, FileDescriptor in, FileDescriptor out, FileDescriptor err) {
-        this.pid = pid;
-        this.inputStream = new ProcessInputStream(in);
-        this.outputStream = new ProcessOutputStream(out);
-        this.errorStream = new ProcessInputStream(err);
-    }
-    public int exitValue() {
-        return InferUndefined.int_undefined();
-    }
-
-    public InputStream getInputStream() {
-        return this.inputStream;
-    }
-
-    public OutputStream getOutputStream() {
-        return this.outputStream;
-    }
-
-    public int waitFor() throws InterruptedException {
-        return InferUndefined.int_undefined();
-    }
-
-    public void destroy() {
-        try {
-            inputStream.close();
-        } catch (IOException e) {}
-        try {
-            outputStream.close();
-        } catch (IOException e) {}
-        try {
-            errorStream.close();
-        } catch (IOException e) {}
-    }
-
-    public Process destroyForcibly() {
-      destroy();
-      return this;
-    }
-
-    private static class ProcessInputStream extends FileInputStream {
-
-        private FileDescriptor fd;
-
-        private ProcessInputStream(FileDescriptor fd) {
-            super(fd);
-            this.fd = fd;
-        }
-
-        @Override
-        public void close() throws IOException {
-            super.close();
-        }
-    }
-
-    private static class ProcessOutputStream extends FileOutputStream {
-
-        private FileDescriptor fd;
+    InferBuiltins.__set_file_attribute(this);
+  }
 
-        private ProcessOutputStream(FileDescriptor fd) {
-            super(fd);
-            this.fd = fd;
-        }
+  public void destroy() {
+    InferBuiltins.__set_mem_attribute(this);
+  }
 
-        @Override
-        public void close() throws IOException {
-            super.close();
-        }
-    }
+  public Process destroyForcibly() {
+    destroy();
+    return this;
+  }
 
 }
diff --git a/infer/models/java/src/java/lang/ProcessManager.java b/infer/models/java/src/java/lang/ProcessManager.java
index 1c7b69621..8537247d1 100644
--- a/infer/models/java/src/java/lang/ProcessManager.java
+++ b/infer/models/java/src/java/lang/ProcessManager.java
@@ -19,47 +19,26 @@ import java.lang.ref.WeakReference;
 
 
 
-final class ProcessManager {
+abstract class ProcessManager {
 
+  public Process exec(String[] taintedCommand, String[] taintedEnvironment, File workingDirectory,
+                      boolean redirectErrorStream) throws IOException {
 
-    public Process exec(String[] taintedCommand, String[] taintedEnvironment, File workingDirectory,
-                        boolean redirectErrorStream) throws IOException {
+    FileDescriptor in = new FileDescriptor();
+    FileDescriptor out = new FileDescriptor();
+    FileDescriptor err = new FileDescriptor();
 
-        FileDescriptor in = new FileDescriptor();
-        FileDescriptor out = new FileDescriptor();
-        FileDescriptor err = new FileDescriptor();
+    ProcessImpl process = new ProcessImpl(InferUndefined.int_undefined(), in, out, err);
+    return process;
+  }
 
-        ProcessImpl process = new ProcessImpl(InferUndefined.int_undefined(), in, out, err);
-        return process;
-    }
-
-    static class ProcessReference extends WeakReference<ProcessImpl> {
-
-        final int processId;
-
-        public ProcessReference(ProcessImpl referent, ProcessReferenceQueue referenceQueue) {
-            super(referent, referenceQueue);
-            this.processId = referent.pid;
-        }
-    }
-
-    static class ProcessReferenceQueue extends ReferenceQueue<ProcessImpl> {
-    }
-
-    static class ProcessImpl extends Process {
-
-        ProcessImpl(int pid, FileDescriptor in, FileDescriptor out, FileDescriptor err) {
-            super(pid, in, out, err);
-        }
-
-        void setExitValue(int exitValue) {
-        }
-    }
+  public static native ProcessManager getInstance();
 
-    private static final ProcessManager instance = new ProcessManager();
+  static class ProcessImpl extends Process {
 
-    public static ProcessManager getInstance() {
-        return instance;
+    ProcessImpl(int pid, FileDescriptor in, FileDescriptor out, FileDescriptor err) {
+      super(pid, in, out, err);
     }
+  }
 
 }
diff --git a/infer/models/java/src/java/lang/Runtime.java b/infer/models/java/src/java/lang/Runtime.java
index 88166367e..3694ba8e3 100644
--- a/infer/models/java/src/java/lang/Runtime.java
+++ b/infer/models/java/src/java/lang/Runtime.java
@@ -15,33 +15,33 @@ import java.io.IOException;
 
 public class Runtime {
 
-    private Runtime() {
-    }
-
-    public Process exec(String command) throws IOException {
-        return exec(command, null, null);
-    }
-
-    public Process exec(String command, String[] envp) throws IOException {
-        return exec(command, envp, null);
-    }
-
-    public Process exec(String command, String[] envp, File dir)
-            throws IOException {
-        return ProcessManager.getInstance().exec(null, envp, null, false);
-    }
-
-    public Process exec(String cmdarray[]) throws IOException {
-        return exec(cmdarray, null, null);
-    }
-
-    public Process exec(String[] cmdarray, String[] envp) throws IOException {
-        return exec(cmdarray, envp, null);
-    }
-
-    public Process exec(String[] cmdarray, String[] envp, File dir)
-            throws IOException {
-        return ProcessManager.getInstance().exec(cmdarray, envp, dir, false);
-    }
+  private Runtime() {
+  }
+
+  public Process exec(String command) throws IOException {
+    return exec(command, null, null);
+  }
+
+  public Process exec(String command, String[] envp) throws IOException {
+    return exec(command, envp, null);
+  }
+
+  public Process exec(String command, String[] envp, File dir)
+    throws IOException {
+    return ProcessManager.getInstance().exec(null, envp, null, false);
+  }
+
+  public Process exec(String cmdarray[]) throws IOException {
+    return exec(cmdarray, null, null);
+  }
+
+  public Process exec(String[] cmdarray, String[] envp) throws IOException {
+    return exec(cmdarray, envp, null);
+  }
+
+  public Process exec(String[] cmdarray, String[] envp, File dir)
+    throws IOException {
+    return ProcessManager.getInstance().exec(cmdarray, envp, dir, false);
+  }
 
 }