cas | Codenotary Community Attestation Service

The ncml data page doesn't challenge you to login until you fill in the form and request some data. I tried a login url which requests a minimal slice of the data in ASCII. It seemed to work then.

It's been a while since I've tried to solve this using a custom addon and it seems to work fine so I'll share it here:

https://gist.github.com/jsmucr/24cf0859dd7c9bba8eb2817d7b0bf4b6

This approach has a bit of disadvantage and that's the fact that it doesn't check if the peer certificate changes.

From previous comments:

The unfound classes are dynamic proxies which are heavily used by the Spring Framework in order to implement AOP. Spring can use both JDK dynamic interface proxies and CGLIB proxies, the latter of which is what we are seeing here. Maybe you should simply ignore those types of classes. They are in fact created dynamically, hence the name. But they are rather a result of dynamic (sub-)class generation than of bytecode transformation.

Yes, I have considered just ignoring those dynamically generated classes, but the whole point of my application was to capture every single method invocation as a user interacts with the web application (such as clicking on a button, etc). In this case, would it be okay to ignore these types of dynamically generated classes? I want to make sure I do not miss any method calls.

As those classes are just dynamic proxies, they will either forward the calls to the original methods or call some AOP or interceptor logic first/instead. Either way, you would not miss anything essential, those proxies are more like switchboards or routers, the actual show happens somewhere else. I recommend you to simply try in a little playgrounds project with an aspect or two.

You also asked how to detect and ignore dynamic proxies by their names:

• CGLIB proxies: Spring's CGLIB proxies contain substrings like $$FastClassBySpringCGLIB$$ or $$EnhancerBySpringCGLIB$$, followed by 8 characters representing 4 hexadecimal bytes. You could either match with a regular expression of just keep it simple and match the substring BySpringCGLIB$$. If non-Spring CGLIB proxies are also in use somewhere in your application, you would have to watch for other naming patterns. But probably you would get similar errors as before when not filtering them, so you would notice automatically.

• JDK proxies: If your Spring application also happens to use JDK proxies, you can identify them easily using JRE API call Proxy.isProxyClass(Class). Thanks to Johannes Kuhn for his comment.

• JDK proxies (old answer): You can filter class names beginning with $Proxy, usually something like com.sun.proxy.$Proxy2 (the trailing number being different). According to the JDK documentation: "The unqualified name of a proxy class is unspecified. The space of class names that begin with the string "$Proxy" is, however, to be reserved for proxy classes." At least for Oracle and probably OpenJDK, you can match for that naming pattern. If that holds true for all JVMs, is up to you to test, if chances are that in your environments others are being used. I quickly tried with Semeru OpenJ9, and the proxy naming pattern is identical, even the package name com.sun.proxy. Pleasae note that in more recent JDK versions, JDK proxies will have fully qualified names like jdk.proxy2.$Proxy25, so in e.g. Java 16 or 17 you should not rely on package name com.sun.proxy. Either add more cases or limit matching to the leading $Proxy in the simple class name.

Update 2022-02-26: Because there was activity on this question, I decided to add some more information about Spring-specific tools which can determine whether an object (or a class) is an AOP proxy (class) and, more specifically, if it is a CGLIB or JDK proxy:

Take a look at tool class AopUtils and its handy methods

• isAopProxy(Object),
• isCglibProxy(Object),
• isJdkDynamicProxy(Object).

No more String matching, simply ask Spring.

BTW, there is also a method net.sf.cglib.proxy.Proxy.isProxyClass(Class) directly in CGLIB, which is supposed to do the same, but within Spring it does not work, probably because Spring uses CGLIB in a non-canonical way. Because Spring embeds a package-relocated CGLIB in its core, the corresponding method org.springframework.cglib.proxy.Proxy.isProxyClass(Class) yields the same faulty result. So if you are working within Spring, please do not use those methods, better use AopUtils.

Here is some example code for your convenience, showing how to determine Spring AOP proxy types (JDK vs. CGLIB proxies) using AopUtils. See also my answer here for how to configure Spring in order to use both proxy types.

BTW, instead of Javassist you could also use AspectJ for your purpose. It sounds like a pretty typical use case.

@blackbishop in comments found that

I was using a non-partitioned window. I needed to partition by department: Window.partitionBy("lib_dep").orderBy("date")

pd.concat should do the job. The reason for that error is that one of the dataframes in concat, which is very likely to be data_transposed, has two columns sharing the same name. To see this, you can replace your last line with

Try transforming your data into the correct format, before feeding it to model.fit:

You should read Working with text data.

Use str.replace:

Seems that you're looking for the pattern '%-c[roaeh]%'

I don't understand java, i have the same question, i just use the error log and read the document to try, maybe the json can help you