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我试图在Google App Engine上使用RoR构建网站。我使用google-appengine gem（http://appengine-jruby.googlecode.com）并按照（http://gist.github.com/268192）中的说明操作。问题是我无法提交任何表格！无法使用appengine-jruby/RoR进行POST：反射不允许
我已经在两个不同的干净的Win 7 Pro环境中试过这个，结果是一样的。
安装Ruby 1.8.6后（一键安装）：
1. gem update --system
2. gem install rails
3. gem install google-appengine
4. gem install rails_dm_datastore
5. gem install activerecord-nulldb-adapter
6. curl -O http://appengine-jruby.googlecode.com/hg/demos/rails2/rails2_appengine.rb
7. ruby rails2_appengine.rb (previously downloaded)
8. rails myproj
9. chmod myproj
10. ruby script/generate dd_model MyModel f1:string f2:float f3:float f4:float f5:integer f6:integer f7:integer -f
11. ruby script/generate scaffold MyModel f1:string f2:float f3:float f4:float f5:integer f6:integer f7:integer -f --skip-migration
12. dev_appserver.rb -p 3000 .
在这一点上，我手动测试中（http://localhost:3000/my_models）支架。索引是好的，然后我用生成的表单创建一个新的注册表，一切正常，但是当我尝试创建第二个注册表时，我得到一个“java.lang.RuntimeException：DummyDynamicScope不应该用于backref存储”安慰。
据我所知，这是JRuby 1.4.1中的一个无法修复的行为，但它在1.5.0中转换为仅调试警告，因此我继续安装预发行版。
13. gem install appengine-jruby-jars --pre
有了这个，这个异常就解决了，一切都很好......直到我将项目移到GAE服务器。
14. ruby appcfg.rb update .
而现在，在（http://myproj.appspot.com/my_models），再次，该指数是好的，也是新的形式，但在我与有效数据提交的那一刻，我得到一个500错误：“java.lang中。 IllegalAccessException：公共int不允许反射“。
正如我所说的，这种行为在本地SDK中不存在。
在这两种情况下，我完全无法发布任何内容。
这就是我现在所拥有的在GAE环境：
Ruby version 1.8.7 (java)
RubyGems disabled
Rack version 1.1
Rails version 2.3.5
Action Pack version 2.3.5
Active Support version 2.3.5
DataMapper version 0.10.2
Environment production
JRuby Runtime version 1.5.0.pre
JRuby-Rack version 0.9.7
AppEngine SDK version Google App Engine/1.3.3
AppEngine APIs version 0.0.15
这是我的龙头安装宝石：
actionmailer (2.3.5)
actionpack (2.3.5)
activerecord (2.3.5)
activerecord-nulldb-adapter (0.2.0)
activeresource (2.3.5)
activesupport (2.3.5)
addressable (2.1.2)
appengine-apis (0.0.15)
appengine-jruby-jars (0.0.8.pre, 0.0.7)
appengine-rack (0.0.8)
appengine-sdk (1.3.3.1)
appengine-tools (0.0.12)
bundler08 (0.8.5)
dm-appengine (0.0.8)
dm-ar-finders (0.10.2)
dm-core (0.10.2)
dm-timestamps (0.10.2)
dm-validations (0.10.2)
extlib (0.9.14)
fxri (0.3.7, 0.3.6)
google-appengine (0.0.12)
hpricot (0.8.2 x86-mswin32, 0.6 mswin32)
jruby-rack (0.9.8, 0.9.7)
log4r (1.1.7, 1.0.5)
rack (1.1.0, 1.0.1)
rails (2.3.5)
rails_appengine (0.0.3)
rails_dm_datastore (0.2.9)
rake (0.8.7, 0.7.3)
rubygems-update (1.3.7, 1.3.6)
rubyzip (0.9.4)
sources (0.0.1)
win32-api (1.4.6 x86-mswin32-60, 1.0.4 mswin32)
win32-clipboard (0.5.2, 0.4.3)
win32-dir (0.3.6, 0.3.2)
win32-eventlog (0.5.2, 0.4.6)
win32-file (0.6.3, 0.5.4)
win32-file-stat (1.3.4, 1.2.7)
win32-process (0.6.2, 0.5.3)
win32-sapi (0.1.5, 0.1.4)
win32-sound (0.4.2, 0.4.1)
windows-api (0.4.0, 0.2.0)
windows-pr (1.0.9, 0.7.2)
我无法附加例外，因为完整的日志的字符限制，但我可以根据请求提供。下面是他们的抽象：
DummyDynamicScope（DEV和PROD ENVS）：
14-may-2010 7:18:40 com.google.appengine.tools.development.ApiProxyLocalImpl log
SEVERE: [1273821520195000] javax.servlet.ServletContext log: Application Error
java.lang.RuntimeException: DummyDynamicScope should never be used for backref storage
at org.jruby.runtime.scope.DummyDynamicScope.getBackRef(DummyDynamicScope.java:49)
at org.jruby.RubyRegexp.updateBackRef(RubyRegexp.java:1404)
at org.jruby.RubyRegexp.updateBackRef(RubyRegexp.java:1396)
at org.jruby.RubyRegexp.search(RubyRegexp.java:1386)
at org.jruby.RubyRegexp.op_match(RubyRegexp.java:1301)
at org.jruby.RubyString.op_match(RubyString.java:1446)
at org.jruby.RubyString$i_method_1_0$RUBYINVOKER$op_match.call(org/jruby/RubyString$i_method_1_0$RUBYINVOKER$op_match.gen)
at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodOneOrN.call(JavaMethod.java:721)
at org.jruby.RubyClass.finvoke(RubyClass.java:472)
at org.jruby.RubyObject.send(RubyObject.java:1442)
at org.jruby.RubyObject$i_method_multi$RUBYINVOKER$send.call(org/jruby/RubyObject$i_method_multi$RUBYINVOKER$send.gen)
at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodZeroOrOneOrTwoOrNBlock.call(JavaMethod.java:276)
at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:330)
at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:189)
at ruby.jit.ruby.C_3a_.Desarrollo.AppEngine.gorgory.WEB_minus_INF.lib.gems_dot_jar.bundler_gems.jruby.$1_dot_8.gems.dm_minus_validations_minus_0_dot_10_dot_2.lib.dm_minus_validations.validators.numeric_validator.validate_with_comparison
at ruby.jit.ruby.C_3a_.Desarrollo.AppEngine.gorgory.WEB_minus_INF.lib.gems_dot_jar.bundler_gems.jruby.$1_dot_8.gems.dm_minus_validations_minus_0_dot_10_dot_2.lib.dm_minus_validations.validators.numeric_validator.validate_with_comparison
at org.jruby.internal.runtime.methods.JittedMethod.call(JittedMethod.java:102)
at org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:144)
at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:280)
at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:69)
at org.jruby.ast.FCallManyArgsNode.interpret(FCallManyArgsNode.java:60)
at org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
at org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:229)
at org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:193)
at org.jruby.RubyClass.finvoke(RubyClass.java:491)
at org.jruby.RubyObject.send(RubyObject.java:1448)
at org.jruby.RubyObject$i_method_multi$RUBYINVOKER$send.call(org/jruby/RubyObject$i_method_multi$RUBYINVOKER$send.gen)
at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodZeroOrOneOrTwoOrThreeOrNBlock.call(JavaMethod.java:293)
at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:350)
at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:229)
at ruby.jit.ruby.C_3a_.Desarrollo.AppEngine.gorgory.WEB_minus_INF.lib.gems_dot_jar.bundler_gems.jruby.$1_dot_8.gems.dm_minus_validations_minus_0_dot_10_dot_2.lib.dm_minus_validations.validators.numeric_validator.validate_with28985350_50
at ruby.jit.ruby.C_3a_.Desarrollo.AppEngine.gorgory.WEB_minus_INF.lib.gems_dot_jar.bundler_gems.jruby.$1_dot_8.gems.dm_minus_validations_minus_0_dot_10_dot_2.lib.dm_minus_validations.validators.numeric_validator.validate_with28985350_50
at org.jruby.internal.runtime.methods.JittedMethod.call(JittedMethod.java:221)
at org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:201)
at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:227)
at org.jruby.ast.FCallThreeArgNode.interpret(FCallThreeArgNode.java:40)
反射（仅督促ENV）：
Java::JavaLang::SecurityException (java.lang.IllegalAccessException: Reflection is not allowed on public int java.lang.String$CaseInsensitiveComparator.compare(java.lang.String,java.lang.String)):
com.google.appengine.runtime.Request.process-92563a0605f433ea(Request.java)
java.lang.reflect.AccessibleObject.setAccessible(AccessibleObject.java:40)
org.jruby.javasupport.JavaMethod.<init>(JavaMethod.java:176)
org.jruby.javasupport.JavaMethod.create(JavaMethod.java:183)
org.jruby.java.invokers.MethodInvoker.createCallable(MethodInvoker.java:23)
org.jruby.java.invokers.RubyToJavaInvoker.<init>(RubyToJavaInvoker.java:63)
org.jruby.java.invokers.MethodInvoker.<init>(MethodInvoker.java:13)
org.jruby.java.invokers.InstanceMethodInvoker.<init>(InstanceMethodInvoker.java:15)
org.jruby.javasupport.JavaClass$InstanceMethodInvokerInstaller.install(JavaClass.java:339)
org.jruby.javasupport.JavaClass.installClassMethods(JavaClass.java:723)
org.jruby.javasupport.JavaClass.setupProxy(JavaClass.java:586)
org.jruby.javasupport.Java.createProxyClass(Java.java:506)
org.jruby.javasupport.Java.getProxyClass(Java.java:445)
org.jruby.javasupport.Java.getInstance(Java.java:354)
org.jruby.javasupport.JavaUtil.convertJavaToUsableRubyObject(JavaUtil.java:143)
org.jruby.javasupport.JavaClass$ConstantField.install(JavaClass.java:360)
org.jruby.javasupport.JavaClass.installClassFields(JavaClass.java:711)
org.jruby.javasupport.JavaClass.setupProxy(JavaClass.java:585)
org.jruby.javasupport.Java.createProxyClass(Java.java:506)
org.jruby.javasupport.Java.getProxyClass(Java.java:445)
org.jruby.javasupport.Java.getProxyOrPackageUnderPackage(Java.java:885)
org.jruby.javasupport.Java.get_proxy_or_package_under_package(Java.java:918)
org.jruby.javasupport.JavaUtilities.get_proxy_or_package_under_package(JavaUtilities.java:54)
org.jruby.javasupport.JavaUtilities$s_method_2_0$RUBYINVOKER$get_proxy_or_package_under_package.call(org/jruby/javasupport/JavaUtilities$s_method_2_0$RUBYINVOKER$get_proxy_or_package_under_package.gen:65535)
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:329)
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:188)
org.jruby.ast.CallTwoArgNode.interpret(CallTwoArgNode.java:59)
org.jruby.ast.NewlineNode.interpret(NewlineNode.java:104)
org.jruby.ast.BlockNode.interpret(BlockNode.java:71)
org.jruby.internal.runtime.methods.InterpretedMethod.call(InterpretedMethod.java:113)
org.jruby.internal.runtime.methods.DefaultMethod.call(DefaultMethod.java:138)
org.jruby.javasupport.util.RuntimeHelpers$MethodMissingMethod.call(RuntimeHelpers.java:389)
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:182)
我应该怎么办？任何提示都将成为欢迎。谢谢！