问题描述
很抱歉输入错误的标题...
免责声明：在网络应用程序方面没有太多经验，主要是使用dropwizard。
所以我一直在尝试在Java Web应用程序中使用guice
最初没有guice，但servlet正确地服务了api，但在将servlet配置为从guice为以下端点提供服务之后，
http://localhost:8080/myServlets/test
我遇到以下错误：
HTTP状态404 –找不到类型状态报告
消息请求的资源[/ myServlets / test]不可用
说明原始服务器未找到当前表示 获取目标资源或不愿意透露其存在。
Apache Tomcat / 8.5.57
具有以下stacktrace：
16-Sep-2020 11:33:43.941 INFO [AsyncFileHandlerWriter-2008362258] org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading Illegal access: this web application instance has been stopped already. Could not load [com.google.inject.internal.util.LineNumbers$LineNumberReader]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [com.google.inject.internal.util.LineNumbers$LineNumberReader]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access.
at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1378)
at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1366)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1218)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1180)
at com.google.inject.internal.util.StackTraceElements$1.load(StackTraceElements.java:49)
at com.google.inject.internal.util.StackTraceElements$1.load(StackTraceElements.java:45)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3529)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2278)
at com.google.common.cache.LocalCache$Segment.lockedGetorLoad(LocalCache.java:2155)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2045)
at com.google.common.cache.LocalCache.get(LocalCache.java:3953)
at com.google.common.cache.LocalCache.getorLoad(LocalCache.java:3976)
at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4960)
at com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4966)
at com.google.inject.internal.util.StackTraceElements.forMember(StackTraceElements.java:71)
at com.google.inject.internal.Messages.formatParameter(Messages.java:286)
at com.google.inject.internal.Messages.formatInjectionPoint(Messages.java:273)
at com.google.inject.internal.Messages.formatSource(Messages.java:229)
at com.google.inject.internal.Messages.formatSource(Messages.java:220)
at com.google.inject.internal.Messages.formatMessages(Messages.java:90)
at com.google.inject.ConfigurationException.getMessage(ConfigurationException.java:73)
at java.base/java.lang.Throwable.getLocalizedMessage(Throwable.java:396)
at java.base/java.lang.Throwable.toString(Throwable.java:485)
at java.base/java.lang.String.valueOf(String.java:2951)
at java.base/java.io.PrintWriter.println(PrintWriter.java:837)
at org.apache.juli.OneLineFormatter$IndentingPrintWriter.println(OneLineFormatter.java:298)
at java.base/java.lang.Throwable$WrappedPrintWriter.println(Throwable.java:768)
at java.base/java.lang.Throwable.printstacktrace(Throwable.java:659)
at java.base/java.lang.Throwable.printstacktrace(Throwable.java:725)
at org.apache.juli.OneLineFormatter.format(OneLineFormatter.java:171)
at org.apache.juli.FileHandler.publish(FileHandler.java:291)
at org.apache.juli.AsyncFileHandler.publishInternal(AsyncFileHandler.java:146)
at org.apache.juli.AsyncFileHandler$LogEntry.flush(AsyncFileHandler.java:185)
at org.apache.juli.AsyncFileHandler$LoggerThread.run(AsyncFileHandler.java:161)
尝试了Guice Git，但由于没有createInjector方法，main部分让我感到困惑。
下面是参考代码，不胜感激！
CacheService
public interface CacheService {
public abstract String hello();
}
CacheServiceImpl
import com.google.inject.Provides;
public class CacheServiceImpl implements CacheService {
@Provides
public String hello() {
return "hello world";
}
}
CacheModule
import com.google.inject.AbstractModule;
public class CacheModule extends AbstractModule {
protected void configure() {
bind(CacheService.class).to(CacheServiceImpl.class);
}
}
MyGuiceServletConfig
public class MyGuiceServletConfig extends Guiceservletcontextlistener {
@Override
protected Injector getInjector() {
return Guice.createInjector(new ServletModule() {
@Override
protected void configureServlets() {
serve("/*").with(ResourceServlet.class);
bind(CacheModule.class);
}
});
}
}
ResourceServlet
@Slf4j
@Path("/")
@Singleton
public class ResourceServlet extends HttpServlet {
@Context
private ServletContext servletContext;
@Inject
public ResourceServlet(CacheService storageModule) throws JAXBException {
log.info("base {}",storageModule.hello());
}
@GET
@Path("/test")
@Produces({MediaType.APPLICATION_JSON})
public Product abc() {
log.info("servletContext {}",servletContext);
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<display-name>myServlets</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<!-- Inject Guice -->
<filter>
<filter-name>guiceFilter</filter-name>
<filter-class>com.google.inject.servlet.GuiceFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>guiceFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>com.myorg.application.guice.MyGuiceServletConfig</listener-class>
</listener>
</web-app>
解决方法
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