Program: 7558
Project: 7558
Buggy source:
public static void main(String[] args) throws Exception {
  OAuthConsumer consumer=new OAuthConsumer("String_Node_Str","String_Node_Str");
  Map<String,Object> additionalParams=new HashMap<String,Object>();
  additionalParams.put("String_Node_Str","String_Node_Str");
  String url="String_Node_Str";
  HttpMethod httpMethod=HttpMethod.GET;
  SignatureMethod signatureMethod=SignatureMethod.HMAC_SHA1;
  String oAuthNonce="String_Node_Str";
  Long oAuthTimestamp=1272026745L;
{
    SignedRequest signedRequest=SignedRequestFactory.create(consumer,additionalParams);
    String signature=signedRequest.getSignature(url,httpMethod,oAuthNonce,oAuthTimestamp);
    String authorizationHeader=signedRequest.getAuthorizationHeader(signature,oAuthNonce,oAuthTimestamp);
    System.out.println(authorizationHeader);
    boolean isValid=SignedRequestVerifier.verify(url,authorizationHeader,consumer,httpMethod,signatureMethod);
    if (isValid) {
      System.out.println("String_Node_Str");
    }
  }
  OAuthAccessToken accessToken=new OAuthAccessToken("String_Node_Str","String_Node_Str");
{
    SignedRequest signedRequest=SignedRequestFactory.create(consumer,accessToken,additionalParams);
    String signature=signedRequest.getSignature(url,httpMethod,oAuthNonce,oAuthTimestamp);
    String authorizationHeader=signedRequest.getAuthorizationHeader(signature,oAuthNonce,oAuthTimestamp);
    System.out.println(authorizationHeader);
    boolean isValid=SignedRequestVerifier.verify(url,authorizationHeader,consumer,accessToken,httpMethod,signatureMethod);
    if (isValid) {
      System.out.println("String_Node_Str");
    }
  }
}

Fixed version (ground truth):
public static void main(String[] args) throws Exception {
  OAuthConsumer consumer=new OAuthConsumer("String_Node_Str","String_Node_Str");
  Map<String,Object> additionalParams=new HashMap<String,Object>();
  additionalParams.put("String_Node_Str","String_Node_Str");
  String url="String_Node_Str";
  String queryString=null;
  HttpMethod httpMethod=HttpMethod.GET;
  SignatureMethod signatureMethod=SignatureMethod.HMAC_SHA1;
  String oAuthNonce="String_Node_Str";
  Long oAuthTimestamp=1272026745L;
{
    SignedRequest signedRequest=SignedRequestFactory.create(consumer,additionalParams);
    String signature=signedRequest.getSignature(url,httpMethod,oAuthNonce,oAuthTimestamp);
    String authorizationHeader=signedRequest.getAuthorizationHeader(signature,oAuthNonce,oAuthTimestamp);
    System.out.println(authorizationHeader);
    boolean isValid=SignedRequestVerifier.verify(url,queryString,authorizationHeader,consumer,httpMethod,signatureMethod);
    if (isValid) {
      System.out.println("String_Node_Str");
    }
  }
  OAuthAccessToken accessToken=new OAuthAccessToken("String_Node_Str","String_Node_Str");
{
    SignedRequest signedRequest=SignedRequestFactory.create(consumer,accessToken,additionalParams);
    String signature=signedRequest.getSignature(url,httpMethod,oAuthNonce,oAuthTimestamp);
    String authorizationHeader=signedRequest.getAuthorizationHeader(signature,oAuthNonce,oAuthTimestamp);
    System.out.println(authorizationHeader);
    boolean isValid=SignedRequestVerifier.verify(url,queryString,authorizationHeader,consumer,accessToken,httpMethod,signatureMethod);
    if (isValid) {
      System.out.println("String_Node_Str");
    }
  }
}