I have a working solution that is using Neo4jClient 1.0.0.646 with no problem. When I install the nuget package for the latest 1.0.0.651 I receive a NullReferenceException on every attempt to return query results. Given the stack trace details below can someone diagnose the issue for me? I am on Json.NET 5.0.6 if that is relevant. I see the REST calls going out and coming back with the correct data so the Cypher is good.
System.NullReferenceException was unhandled by user code
HResult=-2147467261 Message=Object reference not set to an instance
of an object. Source=Neo4jClient StackTrace:
at Neo4jClient.Cypher.CypherQuery.b__0(String
current, String paramName) in
c:\TeamCity\buildAgent\work\5bae2aa9bce99f44\Neo4jClient\Cypher\CypherQuery.cs:line
46
at System.Linq.Enumerable.Aggregate[TSource,TAccumulate](IEnumerable1
source, TAccumulate seed, Func3 func)
at Neo4jClient.Cypher.CypherQuery.get_DebugQueryText() in c:\TeamCity\buildAgent\work\5bae2aa9bce99f44\Neo4jClient\Cypher\CypherQuery.cs:line
43
at Neo4jClient.GraphClient.<>c__DisplayClass1e1.<Neo4jClient.IRawGraphClient.ExecuteGetCypherResultsAsync>b__1d(Task1
responseTask) in
c:\TeamCity\buildAgent\work\5bae2aa9bce99f44\Neo4jClient\GraphClient.cs:line
825
at System.Threading.Tasks.ContinuationResultTaskFromResultTask`2.InnerInvoke()
at System.Threading.Tasks.Task.Execute() InnerException:
You haven't provided enough of the exception detail for me to identify exactly where this is occurring.
Please include the full text of the exception in a new issue at https://github.com/readify/Neo4jClient/issues/new
Here are all the changes since 1.0.0.646, if you want to take a peek for anything related to what you're doing: https://github.com/Readify/Neo4jClient/compare/v1.0.0.646...master
Related
I am struggling to make an Android App, but it always seems to end in this particular failure:
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: Error: Exception while loading assemblies: Java.Interop.Tools.Diagnostics.XamarinAndroidException: error XA0009: Error while loading assembly: bin/Debug/(projectname).dll ---> System.BadImageFormatException: Format of the executable (.exe) or library (.dll) is invalid.
at Mono.Cecil.PE.ImageReader.ReadImage () [0x0002d] in <1b827dd2cbec4ef6829dffcefdcd3b01>:0
at Mono.Cecil.PE.ImageReader.ReadImage (Mono.Disposable1[T] stream, System.String file_name) [0x0000a] in <1b827dd2cbec4ef6829dffcefdcd3b01>:0
at Mono.Cecil.ModuleDefinition.ReadModule (Mono.Disposable1[T] stream, System.String fileName, Mono.Cecil.ReaderParameters parameters) [0x00007] in <1b827dd2cbec4ef6829dffcefdcd3b01>:0
at Mono.Cecil.ModuleDefinition.ReadModule (System.String fileName, Mono.Cecil.ReaderParameters parameters) [0x00073] in <1b827dd2cbec4ef6829dffcefdcd3b01>:0
--- End of inner exception stack trace ---
at Java.Interop.Tools.Diagnostics.Diagnostic.Error (System.Int32 code, System.Exception innerException, System.String message, System.Object[] args) [0x0000a] in :0
at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Load (System.String fileName) [0x00045] in <9ca47d05131d4b8c85910dacd818f0c6>:0
at Xamarin.Android.Tasks.ResolveAssemblies.Execute (Java.Interop.Tools.Cecil.DirectoryAssemblyResolver resolver) [0x00123] in <3f37ea95794e430e91f10accab4cf241>:0 ((projectname))
I am wondering what on earth might be causing the error, as I have tried multiple solutions to avoid the error and it often turns up in such random ways.
Last time I got the error it occurred as follows:
I had a project with only two Activity-files and two Layout files.
I created a gridview in the other layout and tested it on the Android emulator -> all was working well.
I resized the gridview and tested the app with the emulator -> error mentioned above occurred.
I deleted the solution, restored a manual backup saved in an other location, and tested it -> it was working.
I repeated the procedure with the gridview -> error occurred.
Now, as I deleted the project and tried to restore the backup again, even the backup did not work anymore. I tried to build it, then clean it and build but every attempt to build it resulted now as an error.
I seem to get mystic errors from time to time ( like Emulator image stopped working after all I did was just add a button with the designer) but every time troubleshooting eventually comes down to this error and I have to scrap the project. I have been working with Xamarin now 18 hours this weekend and 4 hours have been coding and the rest trying to fix the never-ending errors.
I am using MacBook Pro and have tried running the solution from the default directory and external drive.
So in a nutshell: What causes the error mentioned above and can it be fixed or at least avoided?
I tried to google ( long and hard) but could not find a solution that would be of any help.
Ps. Sorry if the post was not correct, it is my first. Would not have posted in the first place but I am desperate.
Thank you for your patience to read all the way to here.
Since I've decided to switch to server-side rendering from client-side react, I began to create my components and use them in the app.
However I came across this error:
Unknown error (RangeError); potential stack overflow detected
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: Microsoft.ClearScript.ScriptEngineException: Unknown error (RangeError); potential stack overflow detected
And this is a part from the stack-trace
[ScriptEngineException: Unknown error (RangeError); potential stack overflow detected]
V8Exception.ThrowScriptEngineException(V8Exception* ) +169
Microsoft.ClearScript.V8.V8ContextProxyImpl.Execute(String gcDocumentName, String gcCode, Boolean evaluate, Boolean discard) +462
Microsoft.ClearScript.V8.<>c__DisplayClass1b.<Execute>b__19() +197
Microsoft.ClearScript.ScriptEngine.ScriptInvoke(Func`1 func) +70
Microsoft.ClearScript.V8.V8ScriptEngine.BaseScriptInvoke(Func`1 func) +49
Microsoft.ClearScript.V8.<>c__DisplayClass25`1.<ScriptInvoke>b__24() +45
Microsoft.ClearScript.V8.?A0x792c8756.LockCallback(Void* pvArg) +9
Microsoft.ClearScript.V8.V8ContextProxyImpl.InvokeWithLock(Action gcAction) +176
Microsoft.ClearScript.V8.V8ScriptEngine.ScriptInvoke(Func`1 func) +118
Microsoft.ClearScript.V8.V8ScriptEngine.Execute(String documentName, String code, Boolean evaluate, Boolean discard) +118
JavaScriptEngineSwitcher.V8.V8JsEngine.InnerEvaluate(String expression) +89
So I don't know what causes this error but I think it is some code that goes in a loop or something similar. Furthermore if I refresh the page this error goes away and if I continue to refresh intensively it shows up again which is very frustrating.
I was getting the same error (web app in azure) and after some investigation and tests, setting SetAllowMsieEngine to true did in fact fixed the issue also to me.
As Luke McGregor said, this seems to be an issue with V8ScriptEngine and using SetAllowMsieEngine does the job, however this method is latest version of react.net is deprecated and is recommended to "managed in the JavaScriptEngineSwitcher configuration".
So the solution I found so far is to switch js engine switcher by setting it directly in code:
JsEngineSwitcher engineSwitcher = JsEngineSwitcher.Instance;
engineSwitcher.EngineFactories
.AddChakraCore()
.AddMsie( new MsieSettings() { EngineMode = JsEngineMode.Auto } );
engineSwitcher.DefaultEngineName = ChakraCoreJsEngine.EngineName;
Like this I'm using ChakraCore engine rather than default V8 which was causing the error.
So far, during our performance tests with around 250 concurrent requests, we do not have this error anymore when previously in the same conditions for sure this error would have occurred.
This is a known issue, see https://github.com/reactjs/React.NET/issues/190
The work around is to not use V8 to do the render ie:
app.UseReact(config =>
{
config
// ..other configuration settings
.SetAllowMsieEngine(true);
});
Users of an application that I work on are reporting this particular exception with neo4j 2.1.1. This appears to be sporadic and difficult to reproduce. Is this a known issue, or is it associated with any particular misuse or error? I would love to provide more information on how to reproduce this, but I cannot.
The code that creates this stacktrace is really dead simple:
Node n = null;
try (Transaction tx = db.beginTx()) {
n = db.createNode();
// Lots of extra code snipped here because it never makes it that far...
}
The exception seems to be thrown on the createNode() method:
SEVERE: Servlet.service() for servlet [Jersey REST Service] in context with path [/plus] threw exception
org.neo4j.kernel.impl.persistence.ResourceAcquisitionFailedException: TM encountered an unexpected error condition.
at org.neo4j.kernel.impl.persistence.PersistenceManager$ResourceHolder.enlist(PersistenceManager.java:412)
at org.neo4j.kernel.impl.persistence.PersistenceManager$ResourceHolder.forWriting(PersistenceManager.java:394)
at org.neo4j.kernel.impl.api.KernelTransactionImplementation.ensureWriteTransaction(KernelTransactionImplementation.java:190)
at org.neo4j.kernel.impl.api.KernelTransactionImplementation.upgradeToDataTransaction(KernelTransactionImplementation.java:220)
at org.neo4j.kernel.impl.api.KernelStatement.dataWriteOperations(KernelStatement.java:83)
at org.neo4j.kernel.InternalAbstractGraphDatabase.createNode(InternalAbstractGraphDatabase.java:1107)
at org.mitre.provenance.db.neo4j.Neo4JStorage.store(Neo4JStorage.java:1101)
(big stack of servlet related exceptions snipped out here that)
At the bottom, there is this:
Caused by: javax.transaction.RollbackException: Tx status is: STATUS_MARKED_ROLLBACK
at org.neo4j.kernel.impl.transaction.TransactionImpl.enlistResource(TransactionImpl.java:191)
at org.neo4j.kernel.impl.persistence.PersistenceManager$ResourceHolder.enlist(PersistenceManager.java:405)
... 45 more
A lot of fixes have been applied since 2.1.1, so make sure to run on the latest stable version (2.1.4 as of today). If the problem persists on 2.1.4, consider filing a github issue at https://github.com/neo4j/neo4j/issues/new
Ive got a single user who is using Win XP + Chrome (24) to login to to my site,
They enter username\password but an exception is thrown on clicking "Login"
The logs tell me "Exception App_Web_i3opf3mz Object reference not set to an instance of an object".
On Login I set a cookie but I can tell that either the cookie is not being set or the exception is happening before it can set the cookie.
Anyone else seen this error?
I'm a bit lost on what to try...
FYI it appears to be if the browser supports\enabled Javascript
App_Web_$SOME_CHARACTERS$ is the name of an assembly which is generated from your layouts/views/... at runtime.
Do you also log the whole stack trace or have access to the "Event Viewer" (=> eventvrw.exe)? The stack trace should help you to find the origin of the NullReferenceException.
Is the transcoder from protobuf-net to enyim cache deprecated? distributed caching with protobuff-net
Setting my Enyim config just like this app.config causes an error when I try to start the MemcachedClient()
The same for using
transcoder type="ProtoBuf.Caching.Enyim.NetTranscoder"/
System.TypeInitializationException was unhandled by user code
HResult=-2146233036
Message=The type initializer for 'Enyim.Caching.MemcachedClient' threw an exception.
Source=Enyim.Caching
TypeName=Enyim.Caching.MemcachedClient
StackTrace:
at Enyim.Caching.MemcachedClient..ctor()
at Global.asax.cs:line 31
InnerException: System.Configuration.ConfigurationErrorsException
HResult=-2146232062
Message=The value of the property 'transcoder' cannot be parsed. The error is: Object reference not set to an instance of an object. (\web.config line 207)
Source=System.Configuration
BareMessage=The value of the property 'transcoder' cannot be parsed. The error is: Object reference not set to an instance of an object.
StackTrace:
at System.Configuration.BaseConfigurationRecord.EvaluateOne(String[] keys, SectionInput input, Boolean isTrusted, FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult)
at System.Configuration.BaseConfigurationRecord.Evaluate(FactoryRecord factoryRecord, SectionRecord sectionRecord, Object parentResult, Boolean getLkg, Boolean getRuntimeObject, Object& result, Object& resultRuntimeObject)
at System.Configuration.BaseConfigurationRecord.GetSectionRecursive(String configKey, Boolean getLkg, Boolean checkPermission, Boolean getRuntimeObject, Boolean requestIsHere, Object& result, Object& resultRuntimeObject)
at System.Configuration.BaseConfigurationRecord.GetSection(String configKey)
at System.Web.HttpContext.GetSection(String sectionName)
at System.Web.Configuration.HttpConfigurationSystem.GetSection(String sectionName)
at System.Web.Configuration.HttpConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection(String configKey)
at System.Configuration.ConfigurationManager.GetSection(String sectionName)
at Enyim.Caching.MemcachedClient..cctor() in MemcachedClient.cs:line 25
InnerException:
Both installed via nuget and using the latest version available.
Yes (cough), of course that's there! Just see "protobuf-net.Enyim", i.e.
PM> Install-Package protobuf-net.Enyim
(or use the GUI client)
To initialize, you need to configure the transcoder to be an instance of ProtoBuf.Caching.Enyim.NetTranscoder (as per the original instructions). If you are doing this via configuration, note that the assembly for this type is now protobuf-net.Enyim. If I assume the configuration file uses standard notation, then that means you would need to specify (in the config):
<transcoder type="ProtoBuf.Caching.Enyim.NetTranscoder,protobuf-net.Enyim" />
Original answer:
The enyim transcoder is not currently in nuget; however - I will right now take it upon myself to resurrect that, by adding a separate NuGet package (reference EnyimMemcached and protobuf-net) that adds this back in.
Random question... any chance you can point me at a binary memcached download for testing?
One reason this has lagged is that when I first wrote the enyim transcoder, memcached was a simple "run this" - but last time I looked it had gone all "enterprisey", and I couldn't track down a simple package that just had the memcached server. If you can show me where that is now, I'll get it working this weekend.