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我正在尝试读取 har 文件并且readHarFile正在引发空指针异常。这是我尝试使用的示例代码：

public class readhar{
  public static void main(String [] args) throws exception{
    File f = new File ("file path");
    HarFileReader r = new HarFileReader();
    HarLog log = r.readHarFile(f);
    System.out.println(log);
  }
}

例外是：

Exception in thread "main" java.lang.NullPointerException at 
edu.umass.cs.benchlab.har.HarLog.<init>(HarLog.java:134) at 
edu.umass.cs.benchlab.har.tools.HarFileReader.readHarFile(HarFileReader.java:116‌​) at 
edu.umass.cs.benchlab.har.tools.HarFileReader.readHarFile(HarFileReader.java:89) at 
readHar.main(readHar.java:18) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native  Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav‌​a:43)
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