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我正在尝试使用我的 GWT/Maven 项目设置 DCEVM (JDK 1.8 51) 和 HotSwap-Agent，以便能够在不重新启动 GWT 的 Super Devmode 的情况下重新加载更改。首先，我的项目设置如下：

项目-核心 - 数据
-i18n

其中 core 是我运行 mvn gwt:run 的主要模块。这取决于 i18n 和 data 模块，所以我也希望重新加载这些模块。所以在我的 hotswap-agent.properties 中，我放了：

extraClasspath=<pathto>/i18n/target/classes,<pathto>/data/build/target/classes

我已经将 DCEVM 安装为 alt jvm，并像这样设置我的 MAVEN_OPTS：

SET MAVEN_OPTS=-XXaltjvm=dcevm -javaagent:<pathto>/hotswap-agent.jar -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+EnableInvokeDynamic

从这里我做 mvn gwt:run 来启动开发模式。HotSwap-Agent 似乎已正确初始化，如下所示：

HOTSWAP AGENT: 10:43:6.444 INFO (org.hotswap.agent.HotswapAgent) - Loading Hotswap agent {0.3.0-SNAPSHOT} - unlimited runtime class redefinition.
HOTSWAP AGENT: 10:43:6.663 INFO (org.hotswap.agent.config.PluginRegistry) - Discovered plugins: [Hotswapper, WatchResources, AnonymousClassPatch, Hibernate, Spring, Jersey2, Jetty, Tomcat, ZK, Logback, JSF, Seam, ELResolver, OsgiEquinox, Proxy, WebObjects, Weld]
HOTSWAP AGENT: 11:17:46.400 INFO (org.hotswap.agent.config.PluginRegistry) - Plugin 'org.hotswap.agent.plugin.hotswapper.HotswapperPlugin' initialized in ClassLoader 'java.net.URLClassLoader@4d49f239'.

然后 devmode 启动，我可以运行我的应用程序和所有这些。

现在，例如，当我对数据进行 mvn clean install 时，HotSwap-Agent 似乎检测到了更改，但这就是我得到的：

HOTSWAP AGENT: 11:2:38.541 WARNING (org.hotswap.agent.watch.nio.WatcherNIO2) - WatchKey 'sun.nio.fs.WindowsWatchService$WindowsWatchKey@7d9da813' overflowed

然后，一个巨大的列表（看起来我得到了模块中每个类的跟踪）：

HOTSWAP AGENT: 11:2:43.945 ERROR (org.hotswap.agent.annotation.handler.WatchEventCommand) - Unable create CtClass for URI 'file:///<pathto>/data/build/target/classes/<packageto>/DashboardWidget$DashboardWidgetMetaData.class'.
java.lang.IllegalArgumentException: java.io.FileNotFoundException: <pathto>\data\build\target\classes\<packageto>\DashboardWidget$DashboardWidgetMetaData.class (The system cannot find the file specified)
        at org.hotswap.agent.util.IOUtils.toByteArray(IOUtils.java:50)
        at org.hotswap.agent.annotation.handler.WatchEventCommand.createCtClass(WatchEventCommand.java:191)
        at org.hotswap.agent.annotation.handler.WatchEventCommand.onWatchEvent(WatchEventCommand.java:120)
        at org.hotswap.agent.annotation.handler.WatchEventCommand.executeCommand(WatchEventCommand.java:51)
        at org.hotswap.agent.command.impl.CommandExecutor.run(CommandExecutor.java:25)
Caused by: java.io.FileNotFoundException: <pathto>\data\build\target\classes\<packageto>\DashboardWidget$DashboardWidgetMetaData.class (The system cannot find the file specified)
        at java.io.FileInputStream.open0(Native Method)
        at java.io.FileInputStream.open(FileInputStream.java:195)
        at java.io.FileInputStream.<init>(FileInputStream.java:138)
        at java.io.FileInputStream.<init>(FileInputStream.java:93)
        at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)
        at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)
        at java.net.URL.openStream(URL.java:1038)
        at org.hotswap.agent.util.IOUtils.toByteArray(IOUtils.java:44)
        ... 4 more

HOTSWAP AGENT: 11:2:43.945 ERROR (org.hotswap.agent.annotation.handler.WatchEventCommand) - Unable create CtClass for URI 'file:///<pathto>/data/build/target/classes/<packageto>/ItemImage.class'.
java.lang.IllegalArgumentException: java.io.FileNotFoundException: <pathto>\data\build\target\classes\<packageto>\ItemImage.class (The system cannot find the file specified)
        at org.hotswap.agent.util.IOUtils.toByteArray(IOUtils.java:50)
        at org.hotswap.agent.annotation.handler.WatchEventCommand.createCtClass(WatchEventCommand.java:191)
        at org.hotswap.agent.annotation.handler.WatchEventCommand.onWatchEvent(WatchEventCommand.java:120)
        at org.hotswap.agent.annotation.handler.WatchEventCommand.executeCommand(WatchEventCommand.java:51)
        at org.hotswap.agent.command.impl.CommandExecutor.run(CommandExecutor.java:25)
Caused by: java.io.FileNotFoundException: <pathto>\data\build\target\classes\<packageto>\ItemImage.class (The system cannot find the file specified)
        at java.io.FileInputStream.open0(Native Method)
        at java.io.FileInputStream.open(FileInputStream.java:195)
        at java.io.FileInputStream.<init>(FileInputStream.java:138)
        at java.io.FileInputStream.<init>(FileInputStream.java:93)
        at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)
        at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)
        at java.net.URL.openStream(URL.java:1038)
        at org.hotswap.agent.util.IOUtils.toByteArray(IOUtils.java:44)
        ... 4 more

当 hotswap-agent 也注意到我的核心模块发生变化时，这一切都会发生。

毕竟，程序可以正常恢复，但更改不会生效，即使我刷新浏览器也是如此。当我查找溢出消息或 filenotfound 异常（参考 hotswap-agent）时，我没有得到任何搜索结果。所以，我真的不知道发生了什么。任何帮助都会很棒！

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