Error - Reflection is not allowed on private - App Engine

[Anders H]

I am running the GetAccountHierarchy.java example on App Engine with JAX-WS. The application is created using Apache Maven for dependencies and the imported jaxws classes are from adwords-appengine-1.22.0.jar.

When running the app on appspot I get an exception that doesn't tell me much about what could be the problem.

This is the piece of code that throws the exception:
    // Get the ServicedAccountService.
    ManagedCustomerServiceInterface managedCustomerService =
         adWordsServices.get(session, ManagedCustomerServiceInterface.class);

This is the exception:

2013-12-08 11:55:53.087

com.sun.xml.bind.v2.runtime.reflect.Accessor$FieldReflection <init>: Unable to make javax.xml.ws.wsaddressing.W3CEndpointReference.address accessible.
java.lang.SecurityException: java.lang.IllegalAccessException: Reflection is not allowed on private javax.xml.ws.wsaddressing.W3CEndpointReference$Address javax.xml.ws.wsaddressing.W3CEndpointReference.address
	at com.google.appengine.runtime.Request.process-44627206b54ccbe5(Request.java)
	at com.sun.xml.bind.v2.runtime.reflect.Accessor$FieldReflection.<init>(Accessor.java:243)
	at com.sun.xml.bind.AccessorFactoryImpl.createFieldAccessor(AccessorFactoryImpl.java:66)
	at com.sun.xml.bind.v2.model.impl.RuntimeClassInfoImpl.createFieldSeed(RuntimeClassInfoImpl.java:252)
	at com.sun.xml.bind.v2.model.impl.RuntimeClassInfoImpl.createFieldSeed(RuntimeClassInfoImpl.java:81)
	at com.sun.xml.bind.v2.model.impl.ClassInfoImpl.findFieldProperties(ClassInfoImpl.java:405)
	at com.sun.xml.bind.v2.model.impl.ClassInfoImpl.getProperties(ClassInfoImpl.java:308)
	at com.sun.xml.bind.v2.model.impl.RuntimeClassInfoImpl.getProperties(RuntimeClassInfoImpl.java:176)
	at com.sun.xml.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:243)
	at com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:100)
	at com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:81)
	at com.sun.xml.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:209)
	at com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:95)
	at com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:81)
	at com.sun.xml.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:315)
	at com.sun.xml.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:330)
	at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:466)
	at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:302)
	at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1140)
	at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:154)
	at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:121)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:253)
	at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:240)
	at javax.xml.bind.ContextFinder.find(ContextFinder.java:453)
	at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:637)
	at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:584)
	at com.sun.xml.ws.spi.ProviderImpl$2.run(ProviderImpl.java:220)
	at com.sun.xml.ws.spi.ProviderImpl$2.run(ProviderImpl.java:218)
	at java.security.AccessController.doPrivileged(AccessController.java:34)
	at com.sun.xml.ws.spi.ProviderImpl.getEPRJaxbContext(ProviderImpl.java:217)
	at com.sun.xml.ws.spi.ProviderImpl.<clinit>(ProviderImpl.java:88)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
	at java.lang.Class.newInstance(Class.java:370)
	at javax.xml.ws.spi.FactoryFinder.newInstance(FactoryFinder.java:49)
	at javax.xml.ws.spi.FactoryFinder.find(FactoryFinder.java:134)
	at javax.xml.ws.spi.Provider.provider(Provider.java:127)
	at javax.xml.ws.Service.<init>(Service.java:77)
	at com.google.api.ads.adwords.jaxws.v201309.mcm.ManagedCustomerService.<init>(ManagedCustomerService.java:42)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:33)
	at com.google.api.ads.common.lib.soap.jaxws.JaxWsHandler.createSoapClient(JaxWsHandler.java:185)
	at com.google.api.ads.common.lib.soap.jaxws.JaxWsHandler.createSoapClient(JaxWsHandler.java:1)
	at com.google.api.ads.common.lib.factory.helper.BaseAdsServiceClientFactoryHelper.createSoapClient(BaseAdsServiceClientFactoryHelper.java:106)
	at com.google.api.ads.common.lib.factory.helper.BaseAdsServiceClientFactoryHelper.createAdsServiceClient(BaseAdsServiceClientFactoryHelper.java:71)
	at com.google.api.ads.common.lib.factory.AdsServiceClientFactory.getServiceClient(AdsServiceClientFactory.java:73)
	at com.google.api.ads.common.lib.factory.BaseAdsServiceClientFactory.getServiceClientAsInterface(BaseAdsServiceClientFactory.java:79)
	at com.google.api.ads.common.lib.factory.BaseServices.get(BaseServices.java:60)
	at jaxwsdemo.GetAccountHierarchy.runExample(GetAccountHierarchy.java:84)
	at jaxwsdemo.GetAccountHierarchy.main(GetAccountHierarchy.java:78)
	at adwapi.RunExample.doGet(RunExample.java:39)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
	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 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
	at org.mortbay.jetty.servlet.ServletHandler$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 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$RequestHandler.headerComplete(HttpConnection.java:923)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
	at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:435)
	at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:442)
	at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:186)
	at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:306)
	at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:298)
	at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:439)
	at java.lang.Thread.run(Thread.java:724)
Caused by: java.lang.IllegalAccessException: Reflection is not allowed on private javax.xml.ws.wsaddressing.W3CEndpointReference$Address javax.xml.ws.wsaddressing.W3CEndpointReference.address
	... 83 more

I have really been struggling to get AdWords API to work on App Engine, so I really hope that someone can help with this problem.

Thanks,
Anders

[Takeshi Hagikura (AdWords API Team)]

Hi, 

Looks like one of your jars that has binding of jaxws is competing with the Java native implementation.

You need to include only needed jars.

At least dfp-playground works with the Java library with jaxws on appengine. 

Can you please refer to its pom.xml first?
At least you need to change the dfp part to adwords like this. 

<dependency>

<groupId>com.google.api-ads</groupId>

<artifactId>dfp-appengine</artifactId>

<version>1.18.0</version> | v   <dependency>     <groupId>com.google.api-ads</groupId>     <artifactId>adwords-appengine</artifactId>   <version>1.18.0</version>

Best,

- Takeshi

[Anders H]

Hi,

All imported jaxws classes in the Java app are from: com.google.api.ads.adwords.jaxws.v201309.

I have included the pom.xml being used for reference.

Thanks,
Anders

[Anders H]

Just to make sure that the problem is not related to Eclipse / m2e, I have also tried to set up and compile the project using Maven, but without using Eclipse. The result was the same.

[Takeshi Hagikura (AdWords API Team)]

Hi Andres, 

Apologies for the delay. 

At least I got it to work to call the AdWords API services (CampaignService) with the dependencies in the same pom.xml as DfpPlayground + adwords-appengine dependency.

  <dependency>

    <groupId>com.google.api-ads</groupId>

    <artifactId>adwords-appengine</artifactId>

  <version>1.18.0</version>

Can you please try start with that pom.xml first?

I'm not sure which one of all jars you included has the conflict, but at least starting with the pom.xml is the good start.

Best,

- Takeshi, AdWords API Team

[Anders H]

Hi Takeshi,

The different artifact versions from the DfpPlayground pom.xml seems to be quite old. The version used in the example for adwords-appengine is 1.18.0, but the newest version I could find is 1.22.0. I normally try to use the latest stable versions of software components, to get better stability and more functions. Is it documented anywhere which versions should be used for AdWords/appengine?

I tried to use the pom.xml as you suggested, but when I start the devserver I get the following error:

[ERROR] Failed to execute goal com.google.appengine:appengine-maven-plugin:1.8.2:devserver (default-cli) on project dfp-
api-playground: Execution default-cli of goal com.google.appengine:appengine-maven-plugin:1.8.2:devserver failed: A requ
ired class was missing while executing com.google.appengine:appengine-maven-plugin:1.8.2:devserver: Lorg/sonatype/aether
/RepositorySystem;
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/AetherClassNotFound

It looks like there is a problem with the version of Maven that I am using (Maven 3.1.1) and I hope that there is an alternative, so I don't have to downgrade Maven to an older version.

Best,
Anders

[Takeshi Hagikura (AdWords API Team)]

Hi Andres,

It's likely related to this issue http://stackoverflow.com/questions/17665456/maven-3-1-0-breaks-google-app-engine-maven-plugin.

Can you please try the 1.8.3 appengine-maven-plugin?

Best,

- Takeshi, 

[Anders H]

Hi Takeshi,

It helped trying with 1.8.3 on the devserver and I get a nice list of accounts from the MCC, but when uploading to appspot, I still get the error: Reflection is not allowed on private.The error is the same on both the test and prod mcc when running on appspot.

Best,
Anders.

[Takeshi Hagikura (AdWords API Team)]

Hi Andres,

For your reference, this is the pom.xml I used, that worked devserver and appspot.com as well. 

Best,

- Takeshi, AdWords API Team

<?xml version="1.0" encoding="UTF-8"?>

<!--

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *   http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing,

 * software distributed under the License is distributed on an

 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

 * KIND, either express or implied.  See the License for the

 * specific language governing permissions and limitations

 * under the License.

-->

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.google.dfpapi.playground</groupId>

  <artifactId>dfp-api-playground</artifactId>

  <version>test</version>

  <packaging>war</packaging>

  <name>DFP API Playground using AppEngine</name>

  <description>

    An AppEngine project showing the use of the Google Ads Java client libraries

    for DFP API.

  </description>

  <properties>

    <appengine.app.version>1</appengine.app.version>

    <appengine.target.version>1.8.2</appengine.target.version>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

  </properties>

  <build>

    <plugins>

      <plugin>

        <groupId>com.google.appengine</groupId>

        <artifactId>appengine-maven-plugin</artifactId>

        <version>1.8.3</version>

      </plugin>

      <plugin>

        <groupId>org.codehaus.mojo</groupId>

        <artifactId>versions-maven-plugin</artifactId>

        <version>1.3.1</version>

        <configuration>

          <generateBackupPoms>false</generateBackupPoms>

          <includes>

            <include>com.google.api-ads:*</include>

            <include>com.google.http-client:*</include>

          </includes>

        </configuration>

      </plugin>

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <version>2.5.1</version>

        <artifactId>maven-compiler-plugin</artifactId>

        <configuration>

          <source>1.6</source>

          <target>1.6</target>

        </configuration>

      </plugin>

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-war-plugin</artifactId>

        <version>2.3</version>

        <configuration>

          <archiveClasses>true</archiveClasses>

          <webResources>

              <!-- in order to interpolate version from pom into appengine-web.xml -->

              <resource>

                  <directory>${basedir}/src/main/webapp/WEB-INF</directory>

                  <filtering>true</filtering>

                  <targetPath>WEB-INF</targetPath>

              </resource>

          </webResources>

        </configuration>

      </plugin>

    </plugins>

  </build>

  <dependencies>

    <!-- Ads client library dependencies -->

    <dependency>

      <groupId>com.google.api-ads</groupId>

      <artifactId>ads-lib</artifactId>

      <version>1.18.0</version>

    </dependency>

    <dependency>

      <groupId>com.google.api-ads</groupId>

      <artifactId>dfp-appengine</artifactId>

      <version>1.18.0</version>

    </dependency>

    <dependency>

      <groupId>com.google.api-ads</groupId>

      <artifactId>adwords-appengine</artifactId>

      <version>1.18.0</version>

    </dependency>

    <!-- Third party dependencies -->

    <!-- Configuration to use log4j for logging -->

    <dependency>

      <groupId>log4j</groupId>

      <artifactId>log4j</artifactId>

      <version>1.2.16</version>

    </dependency>

    <dependency>

      <groupId>org.slf4j</groupId>

      <artifactId>slf4j-log4j12</artifactId>

      <version>1.6.2</version>

    </dependency>

    <dependency>

      <groupId>javax.jdo</groupId>

      <artifactId>jdo2-api</artifactId>

      <version>2.3-eb</version>

      <exclusions>

        <!-- exclude the legacy javax.transaction:transaction-api and replace it

            with javax.transaction:jta (it appears to be the same thing) -->

        <exclusion>

          <groupId>javax.transaction</groupId>

          <artifactId>transaction-api</artifactId>

        </exclusion>

      </exclusions>

    </dependency>

    <dependency>

      <groupId>javax.transaction</groupId>

      <artifactId>jta</artifactId>

      <version>1.1</version>

    </dependency>

    <dependency>

      <groupId>com.google.appengine.orm</groupId>

      <artifactId>datanucleus-appengine</artifactId>

      <version>1.0.4.1</version>

    </dependency>

    <dependency>

      <groupId>org.datanucleus</groupId>

      <artifactId>datanucleus-core</artifactId>

      <version>1.1.5</version>

      <exclusions>

        <exclusion>

          <groupId>javax.transaction</groupId>

          <artifactId>transaction-api</artifactId>

        </exclusion>

      </exclusions>

    </dependency>

    <dependency>

      <groupId>org.datanucleus</groupId>

      <artifactId>datanucleus-jpa</artifactId>

      <version>1.1.5</version>

      <scope>runtime</scope>

    </dependency>

    <dependency>

      <groupId>org.apache.geronimo.specs</groupId>

      <artifactId>geronimo-jpa_3.0_spec</artifactId>

      <version>1.1.1</version>

      <scope>runtime</scope>

    </dependency>

    <!-- AppEngine plugin dependencies -->

    <dependency>

      <groupId>com.google.appengine</groupId>

      <artifactId>appengine-api-1.0-sdk</artifactId>

      <version>${appengine.target.version}</version>

    </dependency>

    <dependency>

      <groupId>javax.servlet</groupId>

      <artifactId>servlet-api</artifactId>

      <version>2.5</version>

      <scope>provided</scope>

    </dependency>

    <dependency>

      <groupId>jstl</groupId>

      <artifactId>jstl</artifactId>

      <version>1.2</version>

    </dependency>

    <!-- Project dependencies -->

    <dependency>

      <groupId>com.google.inject.extensions</groupId>

      <artifactId>guice-multibindings</artifactId>

      <version>3.0</version>

    </dependency>

    <dependency>

      <groupId>com.google.inject.extensions</groupId>

      <artifactId>guice-servlet</artifactId>

      <version>3.0</version>

    </dependency>

    <dependency>

      <groupId>com.google.code.gson</groupId>

      <artifactId>gson</artifactId>

      <version>2.2.2</version>

    </dependency>

    <dependency>

      <groupId>com.google.http-client</groupId>

      <artifactId>google-http-client-jackson2</artifactId>

      <version>1.16.0-rc</version>

    </dependency>

    <dependency>

      <groupId>xerces</groupId>

      <artifactId>xercesImpl</artifactId>

      <version>2.10.0</version>

    </dependency>

    <!-- Testing dependencies -->

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>4.10</version>

      <scope>test</scope>

    </dependency>

    <dependency>

      <groupId>org.mockito</groupId>

      <artifactId>mockito-all</artifactId>

      <version>1.8.5</version>

      <scope>test</scope>

    </dependency>

    <dependency>

      <groupId>com.google.appengine</groupId>

      <artifactId>appengine-testing</artifactId>

      <version>${appengine.target.version}</version>

      <scope>test</scope>

    </dependency>

    <dependency>

      <groupId>com.google.appengine</groupId>

      <artifactId>appengine-api-stubs</artifactId>

      <version>${appengine.target.version}</version>

      <scope>test</scope>

    </dependency>

  </dependencies>

</project>

[Anders H]

Hi Takeshi,

Same result with your pom.xml.

From the statement:

    ManagedCustomerServiceInterface managedCustomerService =
            adWordsServices.get(session, ManagedCustomerServiceInterface.class);

com.sun.xml.bind.v2.runtime.reflect.Accessor$FieldReflection <init>: Unable to make javax.xml.ws.wsaddressing.W3CEndpointReference.address accessible.
java.lang.SecurityException: java.lang.IllegalAccessException: Reflection is not allowed on private javax.xml.ws.wsaddressing.W3CEndpointReference$Address javax.xml.ws.wsaddressing.W3CEndpointReference.address

What does this exception mean?

Best,
André

[Takeshi Hagikura (AdWords API Team)]

Hi Anders,

The error still looks there is an jar that conflicts the native implementation. 

Let me confirm, do you upload your sources to appengine using "mvn appengine:update"?

I just wanted to make sure unneeded jars are included. 

Best,

- Takeshi, AdWords API Team

[Takeshi Hagikura (AdWords API Team)]

Also is it possible to look your code snippet especially initializing AdWordsSession, AdWordsServices, and ManagedCustomerServiceInterface.

Best,

- Takeshi, 

[Anders H]

Hi Takeshi,

Yes, I can confirm that I have both compiled the sources with "mvn verify" from the command prompt and uploaded with "mvn appengine:update".

Best,
Anders

[Anders H]

Hi Takeshi,

The attached code snippet will reproduce the exception when run on appspot.

Somehow the devserver cannot read the "ads.properties" file, so I am using the ".withClientSecrets" method instead of the ".fromFile" that are used in the examples.

Best,
Anders.

[Takeshi Hagikura (AdWords API Team)]

Hi Anders,

I'm still not sure whether your code or environment (like unneeded jars are included) causes the error.

(Obviously the main method is not intended to be invoked from another class though)

I've put together a simple demo app based on the dfp playground code that just fetches the existing campaigns in an account and 

prints to jsp.

https://github.com/hagikuratakeshi/AdWordsAppengineProofOfConcept

At least the code worked on both devserver and appspot.com. 

Can you try that if your appengine instance works?

Best,

- Takeshi, AdWords API Team

[Anders H]

Hi Takeshi,

Thanks for uploading your demo app which I have been able to run without any issues. My situation is a little different from your demo app as I will be using Oauth2.0 offline credentials for my project, but I will surely study your example for further inspiration.

Is there any special reason to why you are using the appengine-web.xml file for credentials instead of the ads.properties file? I am asking because I have only been able to get it working on the devserver.

Best,
Anders

[Anders H]

Hi, Takeshi,

Correction sorry, I have NOT been able to read the ads.properties file on the devserver (.fromFile() ), it only works on appspot.

Best,
Anders