Program: 80005
Project: 80005
Buggy source:
public java.sql.Connection connect(String url,java.util.Properties properties) throws java.sql.SQLException {
  org.apache.derby.client.net.NetConnection conn;
  try {
    if (exceptionsOnLoadDriver__ != null) {
      throw exceptionsOnLoadDriver__;
    }
    if (properties == null) {
      properties=new java.util.Properties();
    }
    java.util.StringTokenizer urlTokenizer=new java.util.StringTokenizer(url,"String_Node_Str",true);
    int protocol=tokenizeProtocol(url,urlTokenizer);
    if (protocol == 0) {
      return null;
    }
    String slashOrNull=null;
    if (protocol == DERBY_REMOTE_PROTOCOL) {
      try {
        slashOrNull=urlTokenizer.nextToken("String_Node_Str");
      }
 catch (      java.util.NoSuchElementException e) {
        throw new SqlException(null,new ClientMessageId(SQLState.MALFORMED_URL),url,e);
      }
    }
    String server=tokenizeServerName(urlTokenizer,url);
    int port=tokenizeOptionalPortNumber(urlTokenizer,url);
    if (port == 0) {
      port=ClientBaseDataSourceRoot.propertyDefault_portNumber;
    }
    String database=tokenizeDatabase(urlTokenizer,url);
    java.util.Properties augmentedProperties=tokenizeURLProperties(url,properties);
    database=appendDatabaseAttributes(database,augmentedProperties);
    int traceLevel;
    try {
      traceLevel=ClientBaseDataSourceRoot.getTraceLevel(augmentedProperties);
    }
 catch (    java.lang.NumberFormatException e) {
      throw new SqlException(null,new ClientMessageId(SQLState.TRACELEVEL_FORMAT_INVALID),e);
    }
    org.apache.derby.client.am.LogWriter dncLogWriter=ClientBaseDataSourceRoot.computeDncLogWriterForNewConnection(java.sql.DriverManager.getLogWriter(),ClientBaseDataSourceRoot.getTraceDirectory(augmentedProperties),ClientBaseDataSourceRoot.getTraceFile(augmentedProperties),ClientBaseDataSourceRoot.getTraceFileAppend(augmentedProperties),traceLevel,"String_Node_Str",traceFileSuffixIndex_++);
    conn=(org.apache.derby.client.net.NetConnection)getFactory().newNetConnection((org.apache.derby.client.net.NetLogWriter)dncLogWriter,java.sql.DriverManager.getLoginTimeout(),server,port,database,augmentedProperties);
  }
 catch (  SqlException se) {
    throw se.getSQLException();
  }
  if (conn.isConnectionNull())   return null;
  return conn;
}

Fixed version (ground truth):
public java.sql.Connection connect(String url,java.util.Properties properties) throws java.sql.SQLException {
  org.apache.derby.client.net.NetConnection conn;
  checkURLNotNull(url);
  try {
    if (exceptionsOnLoadDriver__ != null) {
      throw exceptionsOnLoadDriver__;
    }
    if (properties == null) {
      properties=new java.util.Properties();
    }
    java.util.StringTokenizer urlTokenizer=new java.util.StringTokenizer(url,"String_Node_Str",true);
    int protocol=tokenizeProtocol(url,urlTokenizer);
    if (protocol == 0) {
      return null;
    }
    String slashOrNull=null;
    if (protocol == DERBY_REMOTE_PROTOCOL) {
      try {
        slashOrNull=urlTokenizer.nextToken("String_Node_Str");
      }
 catch (      java.util.NoSuchElementException e) {
        throw new SqlException(null,new ClientMessageId(SQLState.MALFORMED_URL),url,e);
      }
    }
    String server=tokenizeServerName(urlTokenizer,url);
    int port=tokenizeOptionalPortNumber(urlTokenizer,url);
    if (port == 0) {
      port=ClientBaseDataSourceRoot.propertyDefault_portNumber;
    }
    String database=tokenizeDatabase(urlTokenizer,url);
    java.util.Properties augmentedProperties=tokenizeURLProperties(url,properties);
    database=appendDatabaseAttributes(database,augmentedProperties);
    int traceLevel;
    try {
      traceLevel=ClientBaseDataSourceRoot.getTraceLevel(augmentedProperties);
    }
 catch (    java.lang.NumberFormatException e) {
      throw new SqlException(null,new ClientMessageId(SQLState.TRACELEVEL_FORMAT_INVALID),e);
    }
    org.apache.derby.client.am.LogWriter dncLogWriter=ClientBaseDataSourceRoot.computeDncLogWriterForNewConnection(java.sql.DriverManager.getLogWriter(),ClientBaseDataSourceRoot.getTraceDirectory(augmentedProperties),ClientBaseDataSourceRoot.getTraceFile(augmentedProperties),ClientBaseDataSourceRoot.getTraceFileAppend(augmentedProperties),traceLevel,"String_Node_Str",traceFileSuffixIndex_++);
    conn=(org.apache.derby.client.net.NetConnection)getFactory().newNetConnection((org.apache.derby.client.net.NetLogWriter)dncLogWriter,java.sql.DriverManager.getLoginTimeout(),server,port,database,augmentedProperties);
  }
 catch (  SqlException se) {
    throw se.getSQLException();
  }
  if (conn.isConnectionNull())   return null;
  return conn;
}