我正在编译maven项目，以便在linux机器上运行storm拓扑。
下面是bolt类中的一个方法，我想在运行时创建一个文件，缓冲读取器将从输入中收集数据并将其写入文件。
tuple input object：包含要写入的数据。
/root/data/javacode/top\u output.csv：文件名。
所有io包都已在代码中导入。

public void execute(Tuple input, BasicOutputCollector collector) {
    String sentence = input.getString(0);
    String[] process = sentence.split(" ");
    File file = new File("/root/data/jcode/top_output.csv");
    if (!file.exists()) {
        file.createNewFile();
    }
    FileWriter fw = new FileWriter(file.getAbsoluteFile());  // line no. 36
    BufferedWriter bw = new BufferedWriter(fw);  
    for (String proc : process) {
        proc = proc.trim();
        if (!proc.isEmpty()) {
            collector.emit(new Values(proc));
            bw.write(proc);    // line no. 42
        }
    }
    bw.close();
}

每当我使用mvn包编译项目时，它都会给出编译错误：

[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ lgassStorm ---
[WARNING] File encoding has not been set, using platform encoding UTF-8, i.e. build is platform dependent!
[INFO] Compiling 4 source files to /root/data/lgassStorm/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /root/data/lgassStorm/src/main/java/lgaas/bolts/DataNormalizer.java:[36,19] error: unreported exception IOException; must be caught or declared to be thrown
[ERROR] /root/data/lgassStorm/src/main/java/lgaas/bolts/DataNormalizer.java:[42,13] error: unreported exception IOException; must be caught or declared to be thrown
[INFO] 2 errors

每当我注解与filewriter相关的代码时，它都能成功地工作。上述代码中提到了行号。代码有什么问题？