Question

我正在使用一个简单的try-with-resources语句，如下所示：

try (final CSVWriter w = new CSVWriter(new OutputStreamWriter(r.getOutputStream(), "UTF-8"));){
    //do stuff......
}

使用普通的javac Ant任务进行编译很好，但是当我有Clover首先执行代码时，结果代码不再编译（请参阅下面的编译消息）。

According to the docs，这个版本的Clover确实支持Java 7.还有其他人遇到过这个问题或者知道问题是什么吗？

Java版本：

java version "1.7.0"
Java(TM) SE Runtime Environment (build pxi3270-20110827_01)
IBM J9 VM (build 2.6, JRE 1.7.0 Linux x86-32 20110810_88604 (JIT enabled, AOT enabled)
J9VM - R26_Java726_GA_20110810_1208_B88592
JIT  - r11_20110810_20466
GC   - R26_Java726_GA_20110810_1208_B88592
J9CL - 20110810_88604)
JCL - 20110809_01 based on Oracle 7b147

Ant任务的输出：

compile:
     [echo] Compiling source code...
    [javac] Compiling 135 source files to /home/*********/WEB-INF/classes
   [clover] Clover Version 3.1.2, built on November 07 2011 (build-842)
   [clover] Loaded from: /home/*******/clover.jar
   [clover] Clover: Commercial License registered to *******.
   [clover] Updating existing database at '/home/********/dist/clover/clover.db'.
   [clover] Processing files at 1.7 source level.
   [clover] Clover all over. Instrumented 135 files (12 packages).
   [clover] Elapsed time = 1.597 secs. (84.534 files/sec, 12,463.369 srclines/sec)
    [javac] /tmp/clover2218935617827048125.tmp/com/****/web/DownloadService.java:232: error: illegal start of type
    [javac]                 __CLR3_1_24ae4aegwpi0zhh.R.inc(5592);try (new java.lang.AutoCloseable() {{__CLR3_1_24ae4aegwpi0zhh.R.inc(5593);}public void close(){}};CSVWriter w = new CSVWriter(new OutputStreamWriter(response.getOutputStream(), "UTF-8"));){

Answer 1

您的JDK版本 using optional trailing semicolon to terminate resources list in try-with-resources 似乎不允许使用it's illegal under JSR 334。

检查documentation：

语法：JLS§14.20中TryStatement的现有语法产生集增加了：

TryStatement:
    try ResourceSpecification Block Catchesopt Finallyopt 

Supporting new grammar productions are added:

ResourceSpecification:
    ( Resources ) 
Resources:
    Resource 
    Resource ; Resources 
Resource:
    VariableModifiers Type VariableDeclaratorId = Expression 
    Expression

[组合语法的含义是try语句必须至少有一个catch子句，finally块和资源规范。此外，try语句允许具有这三个组件中的一个。 请注意，在资源规范中使用尾部分号是违法的。]

尝试删除最后一个分号：

try (final CSVWriter w = new CSVWriter(new OutputStreamWriter(r.getOutputStream(), "UTF-8"))){
//do stuff......
}

在Java 7 try-with-resources的Clover检测之后编译失败

1 个答案: