Write temporary files in Java

I want to write temporary files in append mode I see that the file has been created, but the data in the StringBuffer has not been written Can someone tell me why? Please find the code I wrote below,

public static void writeToFile(String pFilename,StringBuffer sb)
        throws IOException {

    String property = "java.io.tmpdir";


    String tempDir = System.getProperty(property);

    File dir = new File(tempDir);
    File filename = File.createTempFile(pFilename,".tmp",dir);
    FileWriter fileWriter = new FileWriter(filename.getName(),true);
    System.out.println(filename.getName());
    BufferedWriter bw = new BufferedWriter(fileWriter);
    bw.write(sb.toString());
    bw.close();
}

Solution

FileWriter fileWriter = new FileWriter(filename.getName(),true);

FileWriter fileWriter = new FileWriter(filename.getName(),true);

should

FileWriter fileWriter = new FileWriter(filename,true);