ehcache升级检查带来的connect timed out

这几天在开发过程中，启动项目会出现一个Timeout的异常

java.net.SocketTimeoutException: connect timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:525)
at sun.net.NetworkClient.doConnect(NetworkClient.java:158)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:323)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:860)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:801)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:726)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1049)
at net.sf.ehcache.util.UpdateChecker.getUpdateProperties(UpdateChecker.java:108)
at net.sf.ehcache.util.UpdateChecker.doCheck(UpdateChecker.java:72)
at net.sf.ehcache.util.UpdateChecker.checkForUpdate(UpdateChecker.java:60)
at net.sf.ehcache.util.UpdateChecker.run(UpdateChecker.java:51)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)

从异常名称（SocketTimeoutException）来看是一个socket连接超时，应该是连接其他资源出现的异常。
接着看堆栈的信息，发现有sun.net.www.http.HttpClient，定位这是一个http请求。但是程序在启动的时候并没有去连接任何外部的http资源啊？奇怪了~继续向下看看会不会有新的发现吧。
果然有发现，ehcache，可爱的缓存怎么还会去请求http资源呢？程序使用RMI方式做ehcache集群配置，不应该会有http请求啊，先不想了，跟到源码里看一下吧。
run->checkForUpdate->doCheck都没什么内容,跟着逻辑就进到了net.sf.ehcache.util.UpdateChecker.getUpdateProperties(其实这个类名已经说明这是在做更新检查了，我竟然忽略的看类名)

private Properties getUpdateProperties(URL updateUrl) throws IOException {
        URLConnection connection = updateUrl.openConnection();
        connection.setConnectTimeout(CONNECT_TIMEOUT);
        InputStream in = connection.getInputStream();
        try {
            Properties props = new Properties();
            props.load(connection.getInputStream());
            return props;
        } finally {
            if (in != null) {
                in.close();
            }
        }
    }

 
扔断点，启动调试观察updateUrl(我竟然还没意识到这是在检测更新)

http://www.terracotta.org/kit/reflector?pageID=update.properties&kitID=ehcache.default&id=-1062731420&os-name=Windows+7&jvm-name=Java+HotSpot%28TM%29+Client+VM&jvm-version=1.6.0_18&platform=x86&tc-version=2.6.3&tc-product=Ehcache+Core+2.6.3&source=Ehcache+Core&uptime-secs=1&patch=UNKNOWN

这么长的地址，但是看这个域名挺眼熟，好像是......没再想了，先把地方放到浏览器上看看是什么

## Top level keys
# general.notice = This notice should rarely, if ever, be used as everyone running ehcache will see it

## 2.6.5 -- latest release
2.6.5.updates = 
2.6.5.notices = This is the latest GA release.
2.6.5.release-notes = http://www.terracotta.org/confluence/display/release/Release+Notes+Ehcache+Core+2.6


## 2.6.3
2.6.3.updates = 2.6.5
2.6.3.notices = This is the latest GA release.
2.6.3.release-notes = http://www.terracotta.org/confluence/display/release/Release+Notes+Ehcache+Core+2.6

## 2.6.2
2.6.2.updates = 2.6.5
2.6.2.notices = We recommend upgrading to 2.6.5, our latest GA release
2.6.2.release-notes = http://www.terracotta.org/confluence/display/release/Release+Notes+Ehcache+Core+2.6


## 2.6.0
2.6.0.updates = 2.6.5
2.6.0.notices = We recommend upgrading to 2.6.5, our latest GA release
2.6.0.release-notes = http://www.terracotta.org/confluence/display/release/Release+Notes+Ehcache+Core+2.5


## 2.5.7
2.5.7.updates = 2.6.5
2.5.7.notices = We recommend upgrading to 2.6.5, our latest GA release
2.5.7.release-notes = http://www.terracotta.org/confluence/display/release/Release+Notes+Ehcache+Core+2.5

2.5.6-SNAPSHOT.updates = 2.6.5

## 2.5.6
2.5.6.updates = 2.6.5
2.5.6.notices = We recommend upgrading to 2.6.5, our latest GA release
2.5.6.release-notes = http://www.terracotta.org/confluence/display/release/Release+Notes+Ehcache+Core+2.5

 
这是什么东西？好像是版本更新~版本更新？版本更新！竟然是版本更新！打开ehcache.xml检查一下

<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd"
         updateCheck="true" monitoring="autodetect" dynamicConfig="true">

竟然真的启动了检查更新，折腾了一大圈，竟然是ehcache在检查版本更新，可能是我浏览器挂了goagent的原因，在浏览器里访问时正常的，但是在程序中确无法访问，所以就出现了Timeout的异常。

把updateCheck改成false就解决了。（写了这么一大堆就最后一句话有用。^_^）

 

评论

1 楼 liuwuhen 2015-07-28