I am facing an odd problem with Freemarker and the classloader that I did not use to have on 6.2.
Basically, there is a minor logic on the top of the template that uses Oauth. This use to work fine and I can't see a problem with it. I tried placing a variation of the Scribe everywhere I could, and even deleting the one that comes inside the ROOT.
What is odd is that the code successfully calls some methods before the exception is thrown, I guess then it is not a classloader problem but an issue with the unwrap operation. Did something change with regards to that functionality?
Code:
${callbackParameters.add(TrueNTHOAuthConstants.REDIRECT, portalUtil.getCurrentCompleteURL(request))}
<#assign trueNTHConnectLoginURL = trueNTHConnect.getAuthorizationUrl(companyId,1, callbackParameters) /> (Exception at this line)
FreeMarker template error:
No compatible overloaded variation was found; can't convert (unwrap) the 3rd argument to the desired Java type.
The FTL type of the argument values were: number (wrapper: f.t.SimpleNumber), number (wrapper: f.t.SimpleNumber), extended_hash+string (org.scribe.model.ParameterList wrapped into f.e.b.StringModel).
**The matching overload was searched among these members**:
com.sun.proxy.$Proxy799.getAuthorizationUrl(long),
com.sun.proxy.$Proxy799.getAuthorizationUrl(long, int, org.scribe.model.ParameterList, org.scribe.model.ParameterList),
com.sun.proxy.$Proxy799.getAuthorizationUrl(long, int, org.scribe.model.ParameterList)
I have just mentioned the classloader as I had to deal with several ClassNotFoundException or class definition not found to get to this point. This was somehow expected (unpredictable behavior) due to the library replication..
It's possible that you have two different classes loaded with org.scribe.model.ParameterList name. So trueNTHConnect uses another version of the problematic class than the methods called before it. The JVM will see them as totally different incompatible classes, hence there's no matching overload.
There's a sure way to find it out: debug or modify FreeMarker at the places where the class names are printed so that it prints the identity hash of the Class objects too.
Related
We have a central logging component which I am now trying to use in a WebJob that I am developing. I am basically following this example. My Activator is identical, I have the bindingModule that has my Bind statements in it. One thing I have done differently here is to use the method versions:
Kernel.Bind(typeof(IExternalSystemLogger)).To(typeof(ExternalSystemLogger));
instead of the generic versions in the example. I currently have constructor injection implemented but I have also set up the parameter injection as per the example. Which ever way I try to do this I end up with the error:
Error indexing method 'Functions.ProcessQueueMessage' ---> System.InvalidOperationException: Cannot bind parameter
or
a null reference exception (with parameter injection). Further into the error I am told that
Make sure the parameter Type is supported by the binding
which is the part that I am finding it difficult to resolve. I have looked at the available method calls on the config object available in WebJob.program but none seems to work. What is it I need to call so that I am correctly resolving my type when I am using a QueueTrigger or BlobTrigger?
I'm in the process of trying to migrate a R# extension project from R# 6 to R# 8. (I've taken over a project that someone wrote, and I'm new to writing extensions.)
In the existing v6 project there is a class that derives from RenameWorkflow, and the constructor used to look like this;
public class RenameStepWorkflow : RenameWorkflow
{
public RenameStepWorkflow(ISolution Solution, string ActionId)
: base(Solution, ActionId)
{
}
This used to work in R# SDK v 6, but now in V8, RenameWorkflow no longer has a constructor that takes Solution and actionId. The new constructor signature now looks like this;
public RenameWorkflow(
IShellLocks locks,
SearchDomainFactory searchDomainFactory,
RenameRefactoringService renameRefactoringService,
ISolution solution,
string actionId);
now heres my problem that I need help with (I think)
I've copied the constructor, and now the constructor of this class has to satisfy these new dependancies. Through some digging I've managed to find a way to satisfy all the dependencies, except for 'SearchDomainFactory'. The closest I can come to instantiating via the updated constructor is as follows;
new RenameStepWorkflow(Solution.Locks, JetBrains.ReSharper.Psi.Search.SearchDomainFactory.Instance, RenameRefactoringService.Instance, this.Solution, null)
All looks good, except that JetBrains.ReSharper.Psi.Search.SearchDomainFactory.Instance is marked as Obsolete, and gives me a compile error that I cannot work around, even using #pragma does not allow me to compile the code. The exact error message I get when I compile is Error 16 'JetBrains.ReSharper.Psi.Search.SearchDomainFactory.Instance' is obsolete: 'Inject me!'
Obvious next question..ok, how? How do I 'inject you'? I cannot find any documentation over this new breaking change, in fact, I cannot find any documentation (or sample projects) that even mentions DrivenRefactoringWorkflow or RenameWorkflow, (the classes that now require the new SearchDomainFactory), or any information on SearchDomainFactory.Instance suddenly now obsolete and how to satisfy the need to 'inject' it.
Any help would be most appreciated! Thank you,
regards
Alan
ReSharper has its own IoC container, which is responsible for creating instances of classes, and "injecting" dependencies as constructor parameters. Classes marked with attributes such as [ShellComponent] or [SolutionComponent] are handled by the container, created when the application starts or a solution is loaded, respectively.
Dependencies should be injected as constructor parameters, rather than using methods like GetComponent<TDependency> or static Instance properties, as this allows the container to control dependency lifetime, and ensure you're depending on appropriate components, and not creating leaks - a shell component cannot depend on a solution component for instance, it won't exist when the shell component is being created.
ReSharper introduced the IoC container a few releases ago, and a large proportion of the codebase has been updated to use it correctly, but there are a few hold-outs, where things are still done in a less than ideal manner - static Instance properties and calls to GetComponent. This is what you've encountered. You should be able to get an instance of SearchDomainFactory by putting it as a constructor parameter in your component.
You can find out more about the Component Model (the IoC container and related functionality) in the devguide: https://www.jetbrains.com/resharper/devguide/Platform/ComponentModel.html
I am trying to load some object through bytecode modification using asm bytecode instrumentation library.
I am retransforming the classes using retransformClasses() method.
I am loading the objects in this way :
super.visitVarInsn(Opcodes.ALOAD, 0);
super.visitFieldInsn(Opcodes.GETFIELD, owner, name, desc);
super.visitMethodInsn(org.objectweb.asm.Opcodes.INVOKESTATIC,
"com/coolcoder/MyClass",
"objectCheckTest",
"(Ljava/lang/Object;)V");`
The problem is that I the objects are getting loaded using usual tranform() of ClassTransformer , but when I am using Attach API's retranformClasses() , these objects are not getting loaded . Strange thing is that , I am not getting any bytecode error either.
Am I doing something wrong ? or am I missing some intricate part regarding retransform ?
I was be able to solve the issue , though I do not know why it happened in the first place.
(1) I was loading the object only on PUTFIELD or PUTSTATIC opcodes, i.e , when the object value is being set.
(2) Just after bytecode modification the class is getting redefined , as a result of which the code snippet did not work.
(3) Next time when the class loaded due to redefinition , the object is already being set , so it will not be called again.
(4) Now , when I checked for GETFIELD or GETSTATIC opcodes , i.e when the object's value is being retrieved and I loaded it , I was able to view its details.
The same approach which I mentioned above is working fine in usual transformation (i.e running with premain).
Any idea on this erratic behaviour of redefinition ?
First, in manifest.mf file,Can-Retransform-Classes attribute should be true.
And your ClassFileTransformer instance should be add with the true value for parameter canRetransform in method addTransformer .
Here is another additional tips:
If the transformer throws an exception (which it doesn't catch), subsequent transformers will still be called and the load, redefine or retransform will still be attempted. Thus, throwing an exception has the same effect as returning null. To prevent unexpected behavior when unchecked exceptions are generated in transformer code, a transformer can catch Throwable. If the transformer believes the classFileBuffer does not represent a validly formatted class file, it should throw an IllegalClassFormatException; while this has the same effect as returning null. it facilitates the logging or debugging of format corruptions.
from java api docs
So, there maybe some uncatched exception which will be just ignored by the jvm arised.
You can put a try..catch
Please forgive my poor English ...
Hypothetic and academic question.
pseudo-code:
<pre><code>
class Book{
read(theReader)
}
class BookWithMemory extends Book {
read(theReader, aTimestamp = null)
}
</pre></code>
Assuming:
an interface (if supported) would prohibit it
default value for parameters are supported
Notes:
PHP triggers an strict standards error for this.
I'm not surprised that PHP strict mode complains about such an override. It's very easy for a similar situation to arise unintentionally in which part of a class hierarchy was edited to use a new signature and a one or a few classes have fallen out of sync.
To avoid the ambiguity, name the new method something different (for this example, maybe readAt?), and override read to call readAt in the new class. This makes the intent plain to the interpreter as well as anyone reading the code.
The actual behavior in such a case is language-dependent -- more specifically, it depends on how much of the signature makes up the method selector, and how parameters are passed.
If the name alone is the selector (as in PHP or Perl), then it's down to how the language handles mismatched method parameter lists. If default arguments are processed at the call site based on the static type of the receiver instead of at the callee's entry point, when called through a base class reference you'd end up with an undefined argument value instead of your specified default, similarly to what would happen if there was no default specified.
If the number of parameters (with or without their types) are part of the method selector (as in Erlang or E), as is common in dynamic languages that run on JVM or CLR, you have two different methods. Create a new overload taking additional arguments, and override the base method with one that calls the new overload with default argument values.
If I am reading the question correctly, this question seems very language specific (as in it is not applicable to all dynamic languages), as I know you can do this in ruby.
class Book
def read(book)
puts book
end
end
class BookWithMemory < Book
def read(book,aTimeStamp = nil)
super book
puts aTimeStamp
end
end
I am not sure about dynamic languages besides ruby. This seems like a pretty subjective question as well, as at least two languages were designed on either side of the issue (method overloading vs not: ruby vs php).
I'm getting an error while trying to load an record through the constructor.
The constructor is:
public Document(Expression<Func<Document,bool>> expression);
and i try to load a single item in like this
var x = new Document(f=>f.publicationnumber=="xxx");
publicationnumber isn't a key but tried making an it an unique key and still no go..
Am i totally wrong regarding the use of the constructor? and can someone please tell me how to use that constructor?
The error i'm getting is:
Test method TestProject1.UnitTest1.ParseFileNameTwoProductSingleLanguage threw exception: System.NullReferenceException:
with the following stacktrace:
SubSonic.Query.SqlQuery.Where[T](Expression1` expression)
Load`[T]`(T item, Expression1expression)
db.Document..ctor(Expression``1 expression) in C:\#Projects\DocumentsSearchAndAdmin\DocumentsSearchAndAdmin\Generated\ActiveRecord.cs: line 5613
rest removed for simplicity
Regards
Dennis
Use == instead of =, i.e.:
...(f=>f.publicationnumber == "xxx");
I've just gotten the SubSonic source, and found out that it had to with the expression parser and my lack of knowledge thereof .. my right side of the expression was actually an item in an string array - and s[PUBNO] (PUBNO is a const) and it was looking for an column named s instead of publicationnumber, i don't know if this i a bug or not in the linq classes
none the less - i've managed to get it to work by creating a local variable containing the value of s[PUBNO] and using that instead...
//dennis