diff --git a/src/main/java/com/ibm/wala/examples/drivers/SourceDirCallGraph.java b/src/main/java/com/ibm/wala/examples/drivers/SourceDirCallGraph.java
new file mode 100644
index 0000000..924b17b
--- /dev/null
+++ b/src/main/java/com/ibm/wala/examples/drivers/SourceDirCallGraph.java
@@ -0,0 +1,126 @@
+package com.ibm.wala.examples.drivers;
+
+import com.ibm.wala.cast.ir.ssa.AstIRFactory;
+import com.ibm.wala.cast.java.client.impl.ZeroOneContainerCFABuilderFactory;
+import com.ibm.wala.cast.java.ipa.callgraph.JavaSourceAnalysisScope;
+import com.ibm.wala.cast.java.translator.jdt.ecj.ECJClassLoaderFactory;
+import com.ibm.wala.classLoader.ClassLoaderFactory;
+import com.ibm.wala.classLoader.SourceDirectoryTreeModule;
+import com.ibm.wala.classLoader.SourceFileModule;
+import com.ibm.wala.ipa.callgraph.AnalysisCacheImpl;
+import com.ibm.wala.ipa.callgraph.AnalysisOptions;
+import com.ibm.wala.ipa.callgraph.AnalysisOptions.ReflectionOptions;
+import com.ibm.wala.ipa.callgraph.AnalysisScope;
+import com.ibm.wala.ipa.callgraph.CallGraph;
+import com.ibm.wala.ipa.callgraph.CallGraphBuilder;
+import com.ibm.wala.ipa.callgraph.CallGraphBuilderCancelException;
+import com.ibm.wala.ipa.callgraph.CallGraphStats;
+import com.ibm.wala.ipa.callgraph.Entrypoint;
+import com.ibm.wala.ipa.callgraph.IAnalysisCacheView;
+import com.ibm.wala.ipa.callgraph.impl.Util;
+import com.ibm.wala.ipa.cha.ClassHierarchyException;
+import com.ibm.wala.ipa.cha.ClassHierarchyFactory;
+import com.ibm.wala.ipa.cha.IClassHierarchy;
+import com.ibm.wala.properties.WalaProperties;
+import com.ibm.wala.ssa.SymbolTable;
+import com.ibm.wala.types.ClassLoaderReference;
+import com.ibm.wala.util.io.CommandLine;
+import com.ibm.wala.util.warnings.Warnings;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.Properties;
+import java.util.jar.JarFile;
+
+/**
+ * Driver that constructs a call graph for an application specified as a directory of source code.
+ * Example of using the JDT front-end based on ECJ. Useful for getting some code to copy-paste.
+ */
+public class SourceDirCallGraph {
+
+  @FunctionalInterface
+  public interface Processor {
+    public void process(CallGraph CG, CallGraphBuilder<?> builder, long time);
+  }
+
+  /**
+   * Usage: SourceDirCallGraph -sourceDir file_path -mainClass class_name
+   *
+   * <p>If given -mainClass, uses main() method of class_name as entrypoint. Class name should start
+   * with an 'L'.
+   *
+   * <p>Example args: -sourceDir /tmp/srcTest -mainClass LFoo
+   */
+  public static void main(String[] args)
+      throws ClassHierarchyException, IllegalArgumentException, CallGraphBuilderCancelException,
+          IOException {
+    System.out.println(Arrays.toString(args));
+    new SourceDirCallGraph()
+        .doit(
+            args,
+            (cg, builder, time) -> {
+              System.out.println("done");
+              System.out.println("took " + time + "ms");
+              System.out.println(CallGraphStats.getStats(cg));
+            });
+  }
+
+  protected ClassLoaderFactory getLoaderFactory(AnalysisScope scope) {
+    return new ECJClassLoaderFactory(scope.getExclusions());
+  }
+
+  public void doit(String[] args, Processor processor)
+      throws ClassHierarchyException, IllegalArgumentException, CallGraphBuilderCancelException,
+          IOException {
+    long start = System.currentTimeMillis();
+    Properties p = CommandLine.parse(args);
+    String sourceDir = p.getProperty("sourceDir");
+    String mainClass = p.getProperty("mainClass");
+    AnalysisScope scope = new JavaSourceAnalysisScope();
+    // add standard libraries to scope
+    String[] stdlibs = WalaProperties.getJ2SEJarFiles();
+    for (String stdlib : stdlibs) {
+      scope.addToScope(ClassLoaderReference.Primordial, new JarFile(stdlib));
+    }
+    // add the source directory
+    File root = new File(sourceDir);
+    if (root.isDirectory()) {
+      scope.addToScope(JavaSourceAnalysisScope.SOURCE, new SourceDirectoryTreeModule(root));
+    } else {
+      String srcFileName = sourceDir.substring(sourceDir.lastIndexOf(File.separator) + 1);
+      assert root.exists() : "couldn't find " + sourceDir;
+      scope.addToScope(
+          JavaSourceAnalysisScope.SOURCE, new SourceFileModule(root, srcFileName, null));
+    }
+
+    // build the class hierarchy
+    IClassHierarchy cha = ClassHierarchyFactory.make(scope, getLoaderFactory(scope));
+    System.out.println(cha.getNumberOfClasses() + " classes");
+    System.out.println(Warnings.asString());
+    Warnings.clear();
+    AnalysisOptions options = new AnalysisOptions();
+    Iterable<Entrypoint> entrypoints = getEntrypoints(mainClass, cha);
+    options.setEntrypoints(entrypoints);
+    options.getSSAOptions().setDefaultValues(SymbolTable::getDefaultValue);
+    // you can dial down reflection handling if you like
+    options.setReflectionOptions(ReflectionOptions.NONE);
+    IAnalysisCacheView cache =
+        new AnalysisCacheImpl(AstIRFactory.makeDefaultFactory(), options.getSSAOptions());
+    // CallGraphBuilder builder = new ZeroCFABuilderFactory().make(options, cache,
+    // cha, scope,
+    // false);
+    CallGraphBuilder<?> builder = new ZeroOneContainerCFABuilderFactory().make(options, cache, cha, scope);
+    System.out.println("building call graph...");
+    CallGraph cg = builder.makeCallGraph(options, null);
+    long end = System.currentTimeMillis();
+
+    processor.process(cg, builder, end - start);
+  }
+
+  protected Iterable<Entrypoint> getEntrypoints(String mainClass, IClassHierarchy cha) {
+    Iterable<Entrypoint> entrypoints =
+        Util.makeMainEntrypoints(JavaSourceAnalysisScope.SOURCE, cha, new String[] {mainClass});
+    return entrypoints;
+  }
+}