Endpoints: Local development server returns 500 but App Engine works fine
Question
I have set up an endpoint project with Android Studio. Everything worked perfectly fine, until I configured the local development server for testing on a real Android device instead of the emulator. Since then the local development server seems not to expose _ah/api/ anymore.
The server is running and I can access it from localhost and from the Android device. It serves the static website at root, it serves _ah/admin fine, but it fails to serve _ah/api/explorer and also the webservices seem not to be working.
The server gives me the following error when accessing Api Explorer:
http://localhost:8080/_ah/api/explorer
HTTP ERROR 500
Problem accessing /_ah/api/explorer. Reason:
Error while processing method void in API api VERSION v1
Caused by:
java.lang.IllegalArgumentException: Error while processing method void in API api VERSION v1
at com.google.api.server.spi.tools.devserver.PathTrie.add(PathTrie.java:61)
at com.google.api.server.spi.tools.devserver.PathTrie.<init>(PathTrie.java:42)
at com.google.api.server.spi.tools.devserver.RestApiServlet.loadApiConfigs(RestApiServlet.java:111)
at com.google.api.server.spi.tools.devserver.ApiServlet.initConfigsIfNecessary(ApiServlet.java:71)
at com.google.api.server.spi.tools.devserver.RestApiServlet.service(RestApiServlet.java:117)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.appengine.tools.appstats.AppstatsFilter.doFilter(AppstatsFilter.java:142)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.googlecode.objectify.cache.AsyncCacheFilter.doFilter(AsyncCacheFilter.java:58)
at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:127)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:98)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:491)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.IllegalArgumentException: Path '/post/api/v1/void' is already mapped
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.add(PathTrie.java:111)
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.add(PathTrie.java:126)
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.add(PathTrie.java:126)
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.add(PathTrie.java:126)
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.add(PathTrie.java:126)
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.access$100(PathTrie.java:88)
at com.google.api.server.spi.tools.devserver.PathTrie.add(PathTrie.java:58)
... 45 more
Caused by:
java.lang.IllegalArgumentException: Path '/post/api/v1/void' is already mapped
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.add(PathTrie.java:111)
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.add(PathTrie.java:126)
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.add(PathTrie.java:126)
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.add(PathTrie.java:126)
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.add(PathTrie.java:126)
at com.google.api.server.spi.tools.devserver.PathTrie$PathTrieNode.access$100(PathTrie.java:88)
at com.google.api.server.spi.tools.devserver.PathTrie.add(PathTrie.java:58)
at com.google.api.server.spi.tools.devserver.PathTrie.<init>(PathTrie.java:42)
at com.google.api.server.spi.tools.devserver.RestApiServlet.loadApiConfigs(RestApiServlet.java:111)
at com.google.api.server.spi.tools.devserver.ApiServlet.initConfigsIfNecessary(ApiServlet.java:71)
at com.google.api.server.spi.tools.devserver.RestApiServlet.service(RestApiServlet.java:117)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.appengine.tools.appstats.AppstatsFilter.doFilter(AppstatsFilter.java:142)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.googlecode.objectify.cache.AsyncCacheFilter.doFilter(AsyncCacheFilter.java:58)
at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:127)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:98)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:491)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Powered by Jetty://
"java.lang.IllegalArgumentException: Path '/post/api/v1/void' is already mapped" looks strange to me. Can anybody tell me where to look at? "/void" sounds like a strange method.
My gradle.build looks like this:
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.google.appengine:gradle-appengine-plugin:1.9.5'
}
}
repositories {
mavenCentral();
}
apply plugin: 'java'
apply plugin: 'war'
apply plugin: 'appengine'
sourceCompatibility = 1.7
targetCompatibility = 1.7
dependencies {
appengineSdk 'com.google.appengine:appengine-java-sdk:1.9.5'
compile 'com.google.appengine:appengine-endpoints:1.9.5'
compile 'com.google.appengine:appengine-endpoints-deps:1.9.5'
compile 'javax.servlet:servlet-api:2.5'
compile 'com.googlecode.objectify:objectify:5.0.2'
}
appengine {
downloadSdk = true
appcfg {
oauth2 = true
}
endpoints {
getClientLibsOnBuild = true
getDiscoveryDocsOnBuild = true
}
}
And this is my web.xml:
<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" version="2.5">
<welcome-file-list>
<welcome-file>index.html</welcome-file>
</welcome-file-list>
<!-- Endpoints configuration -->
<servlet>
<servlet-name>SystemServiceServlet</servlet-name>
<servlet-class>com.google.api.server.spi.SystemServiceServlet</servlet-class>
<init-param>
<param-name>services</param-name>
<param-value>
<!-- Registration endpoints -->
cc.closeup.backend.endpoints.AccountEndpoint, cc.closeup.backend.endpoints.AccountsEndpoint,
cc.closeup.backend.endpoints.ProfileEndpoint,
cc.closeup.backend.endpoints.RegistrationEndpoint,
cc.closeup.backend.endpoints.SessionEndpoint, cc.closeup.backend.endpoints.SessionsEndpoint,
cc.closeup.backend.endpoints.UserEndpoint,
<!-- Graph endpoints -->
cc.closeup.backend.endpoints.LikeEndpoint, cc.closeup.backend.endpoints.LikesEndpoint,
cc.closeup.backend.endpoints.MessageEndpoint, cc.closeup.backend.endpoints.MessagesEndpoint,
cc.closeup.backend.endpoints.RelationEndpoint, cc.closeup.backend.endpoints.RelationsEndpoint,
<!-- Tile endpoints -->
cc.closeup.backend.endpoints.TileEndpoint, cc.closeup.backend.endpoints.TilesEndpoint,
cc.closeup.backend.endpoints.LayerEndpoint, cc.closeup.backend.endpoints.LayersEndpoint
</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>SystemServiceServlet</servlet-name>
<url-pattern>/_ah/spi/*</url-pattern>
</servlet-mapping>
<!-- Objectify configuration -->
<filter>
<filter-name>ObjectifyFilter</filter-name>
<filter-class>com.googlecode.objectify.ObjectifyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>ObjectifyFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Appstats configuration -->
<filter>
<filter-name>appstats</filter-name>
<filter-class>com.google.appengine.tools.appstats.AppstatsFilter</filter-class>
<init-param>
<param-name>calculateRpcCosts</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>appstats</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>appstats</servlet-name>
<servlet-class>com.google.appengine.tools.appstats.AppstatsServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>appstats</servlet-name>
<url-pattern>/appstats/*</url-pattern>
</servlet-mapping>
<security-constraint>
<web-resource-collection>
<web-resource-name>appstats</web-resource-name>
<url-pattern>/appstats/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<role-name>admin</role-name>
</auth-constraint>
</security-constraint>
</web-app>
Server startup log looks like this (Windows):
"C:\Program Files\Java\jdk1.8.0_05\bin\java" "-javaagent:C:\Users\Oliver Hausler\.gradle\appengine-sdk\appengine-java-sdk-1.9.1\lib\agent\appengine-agent.jar" "-Xbootclasspath/p:C:\Users\Oliver Hausler\.gradle\appengine-sdk\appengine-java-sdk-1.9.1\lib\override\appengine-dev-jdk-overrides.jar" -Didea.launcher.port=7536 "-Didea.launcher.bin.path=C:\Users\Oliver Hausler\AppData\Local\Android\android-studio\bin" -Dfile.encoding=windows-1252 -classpath "C:\Users\Oliver Hausler\.gradle\appengine-sdk\appengine-java-sdk-1.9.1\lib\appengine-tools-api.jar;C:\Users\Oliver Hausler\AppData\Local\Android\android-studio\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.google.appengine.tools.development.DevAppServerMain --address=0.0.0.0 --port=8080 "C:\Users\Oliver Hausler\AndroidStudioProjects\csnty.android\source\Gangstas\backend\build\exploded-app"
Jun 07, 2014 9:09:46 PM com.google.appengine.tools.development.agent.AppEngineDevAgent premain
SEVERE: Unable to load the App Engine dev agent. Security restrictions will not be completely emulated.
java.lang.RuntimeException: Unexpected exception during cast.
at com.google.apphosting.utils.clearcast.ClearCast$CasterImpl.cast(ClearCast.java:385)
at com.google.apphosting.utils.clearcast.ClearCast.staticCast(ClearCast.java:252)
at com.google.apphosting.utils.clearcast.ClearCast.staticCast(ClearCast.java:263)
at com.google.appengine.tools.development.agent.AppEngineDevAgent.premain(AppEngineDevAgent.java:61)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:386)
at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)
Caused by: java.lang.IllegalAccessException: Class com.google.apphosting.utils.clearcast.ClearCast$CasterImpl can not access a member of class com.google.appengine.tools.development.agent.$Proxy0 with modifiers "public"
at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:101)
at java.lang.reflect.AccessibleObject.slowCheckMemberAccess(AccessibleObject.java:295)
at java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:287)
at java.lang.reflect.Constructor.newInstance(Constructor.java:398)
at com.google.apphosting.utils.clearcast.ClearCast$CasterImpl.cast(ClearCast.java:383)
... 9 more
Jun 07, 2014 9:09:47 PM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
********************************************************
There is a new version of the SDK available.
-----------
Latest SDK:
Release: 1.9.5
Timestamp: Wed Apr 30 18:55:22 PDT 2014
API versions: [1.0]
-----------
Your SDK:
Release: 1.9.1
Timestamp: Wed Mar 12 16:46:05 PDT 2014
API versions: [1.0]
-----------
Please visit https://developers.google.com/appengine/downloads for the latest SDK.
********************************************************
Jun 07, 2014 9:09:49 PM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml
INFO: Successfully processed C:\Users\Oliver Hausler\AndroidStudioProjects\csnty.android\source\Gangstas\backend\build\exploded-app\WEB-INF/appengine-web.xml
Jun 07, 2014 9:09:49 PM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
INFO: Successfully processed C:\Users\Oliver Hausler\AndroidStudioProjects\csnty.android\source\Gangstas\backend\build\exploded-app\WEB-INF/web.xml
Jun 07, 2014 9:09:49 PM com.google.appengine.tools.development.SystemPropertiesManager setSystemProperties
INFO: Overwriting system property key 'java.util.logging.config.file', value 'C:\Users\Oliver Hausler\.gradle\appengine-sdk\appengine-java-sdk-1.9.1\config\sdk\logging.properties' with value 'WEB-INF/logging.properties' from 'C:\Users\Oliver Hausler\AndroidStudioProjects\csnty.android\source\Gangstas\backend\build\exploded-app\WEB-INF\appengine-web.xml'
Jun 07, 2014 9:09:50 PM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
Jun 07, 2014 9:09:51 PM com.google.apphosting.utils.jetty.JettyLogger info
INFO: jetty-6.1.x
Jun 07, 2014 9:09:53 PM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Started SelectChannelConnector@0.0.0.0:8080
Jun 07, 2014 9:09:53 PM com.google.appengine.tools.development.AbstractModule startup
INFO: Module instance default is running at http://localhost:8080/
Jun 07, 2014 9:09:53 PM com.google.appengine.tools.development.AbstractModule startup
INFO: The admin console is running at http://localhost:8080/_ah/admin
Jun 07, 2014 9:09:53 PM com.google.appengine.tools.development.DevAppServerImpl doStart
INFO: Dev App Server is now running
2 answers
solution1
0 2014-06-09 00:36:48
The solution is very simple. Not a server misconfiguratuion as I thought at first, but the simple mistake that I returned void in an endpoint class, which REST doesn't seem to allow.
WRONG:
@ApiMethod(name = "layer.insert")
public void insertLayer(
final Layer layer
) {
//...
}
GOOD:
@ApiMethod(name = "layer.insert")
public Layer insertLayer(
final Layer layer
) {
//...
return layer;
}
So even if you don't need the return, make Google some money and always return the result ;-(
solution2
0 2014-07-11 00:54:15
Try setting the httpMethod to POST if you are not going to return any data
like this :
@ApiMethod(name = "layer.insert", httpMethod = ApiMethod.HttpMethod.POST)
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.
Related Question
google app engine server reports error but on local server the code works fine
Google App Engine: ClassNotFoundException after deploy but runs fine on local server
Works on development server but it doesn't on Google App Engine (Sessions)
Google Cloud Endpoints v2: Testing API key mechanism for an app-engine app executed on the local development machine
client receiving 500 (GoogleJsonResponseException) although app-engine endpoint server seems to work fine
Google App Engine Endpoints API Dev Server
HTTP 500 Internal Server Error In App Engine
app engine datastore stats on development server
App Engine: Endpoints not updated
Registration with Endpoints Server FAILED (App Engine connected Android Project)
Related Tags