I've started the tutorial "Play for java. I've downloaded activator, unzip it and create a new java-project.
Loaded it with IntellliJ IDEA 14.1.3, set java 8 to the project SDK and language level, then run the application. Everything works fine exept a few strange moments.
Start page with documentation and "Play for Java" tutorial describe the index method as:
public static Result index() {
return ok( index.render("Your new application is ready."));
}
Fine, but template contains not static method. If I define it as static, than I'll get such error:
"Compilation error" -> value index is not a member of controllers.Application
And the error line is in routes file:
GET / controllers.Application.index()
So, what is wrong? According to tutorial and documentation it should works with static methods...
I'm also getting annoying error in my IDE: "Cannot resolve method ok(java.lang.Object)" for the method above.
If I'm leaving index method non-static, than my IDE highlight method index() in the routes config file with mart "Cannot resolve: under constraction". This error dissapear for static method, but in this case the project won't compile successfully.
Can someone give an explanation?
Related
I have a problem integrating Java code into KNIME. Similar posts on Knime forum (http://tech.knime.org/forum/knime-general/using-external-jar-in-java-snippet-node-workflow-not-able-to-initialize-class-of) were of little help and I also posted a question there but have not got answer so far, so I'm trying my luck here.
I am trying to integrate my code into KNIME workflow using JavaSnippet. I have exported the code into a jar and put it into the KNIME jre/lib/endorsed folder. The code references CDK 1.4.19 and I have also placed the corresponding jar file into the same directory. I do not have CDK node extensions installed in KNIME and using them is also not an option in my case.
The code starts with:
IChemObjectBuilder builder = SilentChemObjectBuilder.getInstance();
SmilesParser sp= new SmilesParser(builder);
When I try to execute JavaSnippet I get the following exception message:
Evaluation of java snippet failed for row "Row0". Exception message: Could not initialize class org.openscience.cdk.smiles.SmilesParser
When I just try
IChemObjectBuilder builder = SilentChemObjectBuilder.getInstance();
It works and I get no exception message. I have checked, the builder is not a null. However, when I try to initialize SmilesParser, it fails. This class is public. It has no default constructor and has one public constructor that takes IChemObjectBuilder as a parameter.
I have tried to use class loader:
URL[] classLoaderUrls = new URL[]{new URL("file:///path on my computer/knime_2.9.4/jre/lib/endorsed/cdk-1.4.19.jar")};
URLClassLoader urlClassLoader = new URLClassLoader(classLoaderUrls);
Class<?> parserClass = urlClassLoader.loadClass("org.openscience.cdk.smiles.SmilesParser");
Class[] classParameters = new Class[] {IChemObjectBuilder.class};
Constructor<?> constructor = parserClass.getConstructor(classParameters); //until this line there are no problems
Object parser = constructor.newInstance(builder); //fails here with the same exception message: Could not initialize class org.openscience.cdk.smiles.SmilesParser
I am sure that this is not a CDK error because I can execute the code in Eclipse.
Why can a constructor of one class be called from KNIME without any problems and a constructor of another class can not??
I would be very grateful if you could suggest a solution or a probable reason why this happens.
Thank you!
Ok, finally solved the problem myself. Cleaned project meta data, cleaned endorsed library directory, switched KNIME workspace to another directory, put all jars into one folder and added them as external libraries. Now it works:)
i'm using the LibGdx framework to create a game and I'm using Eclipse 4.4 (Luna). Whilst i'm debugging my application this method is breaking.
#Override
public void run() {
setName("GLThread " + getId());
if (LOG_THREADS) {
Log.i("GLThread", "starting tid=" + getId());
}
try {
guardedRun();
} catch (InterruptedException e) {
// fall thru and exit normally
} finally {
sGLThreadManager.threadExiting(this);
}
}
inside the GLSurfaceView Android class, with the stack trace:
Thread [GLThread 232] (Suspended (exception NullPointerException))
GLSurfaceView$GLThread.run() line: 1243
I know what a NullPointerException is, I know somewhere is passing a null value, but what I would like to know is how can I find out where?
With these types of questions, I can only assume you'll need more code but I don't know where I should be looking, I'll post code from the Java classes on request if anyone has an idea of where I should be looking.
Note: I'm not using GLSurfaceView directly anywhere in my code, I'm assuming it's a library from Libgdx. Unless it's something i'm missing?
UPDATE: Found the issue in detail.
GLSurfaceView$GLThread.class [in android.opengl [in C:\Users\me\AppData\Local\Android\android-sdk\platforms\android-8\android.jar]] does not exist
Solution:
An AtlasRegion was being called from the renderer class without being assigned a value in the assets class hence the null Exception
What is a NullPointerException, and how do I fix it?
changing that to a field that is declared solved this problem for me on the code side.
For the solution to the backend issue:
GLSurfaceView$GLThread.class [in android.opengl [in C:\Users\me\AppData\Local\Android\android-sdk\platforms\android-8\android.jar]] does not exist
I downloaded source codes from Google, and assigned the source code inside the SDK folder, C:\Users\me\AppData\Local\Android\android-sdk\sources\, if you don't already have a source folder create one, put the sources in there and it should reload the class that was being handled. (in this case GLSurfaceView.class for API 2.2)
Another way In Eclipse 4.4 (Luna) or any other eclipse I do believe, go onto your project folder right click > properties > java build path and assign the source file for android.jar in your dependent libraries.
I'm trying to debug an java eclipse project with some problem!
I'm starting using CGLIB to make faster reflection calls using the index metod.
example
FastClass fastClass = FastClass.create(getClass());
int index = fastClass.getIndex("methodName", new Class[] { Object.class });
fastClass.invoke(index, this, new Object[] { obj } );
now when i try to put a breakpoint into a class that is called by fastreflection method this is the eclipse output.
I try to change compiler option on generate line number with no results.
I also upload an eclipse project (built with Juno version) that replicates the problem!!
http://www.filefactory.com/file/4zryz3gjgbyh/n/FastDebug.rar
Thanks!
I "resolved"(understand) the problem, but it is not a problem with Eclipse. When you launch
the program this line: FastClass.create(ReflectionTarget.class); ends up
creating an entirely new version of the compiled class removing all
non-essential stuff from the classfile to make it "fast" - that includes all
the line number / debug infos, which means the breakpoint cannot be set in it.
http://cglib.sourceforge.net/xref/net/sf/cglib/core/package-summary.html
There's no javadoc and you need to read the source but now i understand this is not a
problem but a feature of this method to make fast reflection!
i have a grails project with an Image Domain Class and Controller.
I just installed the grails ImageTools 1.0.4 Plugin and i would like to generate thumbnails for images wich will be uploaded.
My Image-Domain-Class:
class Image {
byte[] data
//String name
byte[] thumbnail
static constraints = {
//name()
data()
}
}
The "safe"-action in my Controller:
def save = {
def imageInstance = new Image(params)
def imageTool = new ImageTool()
imageTool.load(imageInstance.data)
imageTool.thumbnail(320)
imageInstance.thumbnail = imageTool.getBytes("JPEG") //Here is my problem!
if(!imageInstance.hasErrors() && imageInstance.save()) {
flash.message = "Image ${imageInstance.id} created"
redirect(action:show,id:imageInstance.id)
}
else {
render(view:'create',model:[imageInstance:imageInstance])
}
}
When I start my Grails-application and uploading an image I'm getting the following error-message:
Error 200: groovy.lang.MissingMethodException: No signature of method: ImageTool.getBytes() is applicable for argument types: (java.lang.String) values: {"JPEG"}
Servlet: grails
URI: /grailsproject/grails/image/save.dispatch
Exception Message: No signature of method: ImageTool.getBytes() is applicable for argument types: (java.lang.String) values: {"JPEG"}
Caused by: groovy.lang.MissingMethodException: No signature of method: ImageTool.getBytes() is applicable for argument types: (java.lang.String) values: {"JPEG"}
Class: GrailsAuthenticationProcessingFilter
At Line: [57]
It says that the Method getBytes() is missing but the method is still available. My IDE intelliJ also recognizes no errors.
So what can I do? Could someone help me please?
Sorry for my bad english. If you are german, please look at http://support-network.info/board/problem-mit-imagetools-getbytes-t3008.html .
I use Grails 1.0.4.
I could fix this error message. I just copied the getBytes() method from the git Repository of Ricardo (the plugin developer) and replaced the old one with the new one. Now everything works! I don't know where the bug was but i'm happy that i solved it.
Thank you both very much!
Looks like that method is a fairly new addition to the class (3/6/2009). If you have verified that that method is in the ./plugins/imagetools/src/groovy/ImageTool.groovy file I'd recommend running:
grails clean
If you had been using this plugin prior it might be a cache problem.
The reply that you received from John sounds about right - if you have installed the new plugin and can see the code, but keep getting this error only outside IntelliJ, you should try cleaning your grails cache - it's very possible that an older copy of the plugin is precompiled on the cache.
Are you using Grails 1.1? I haven't yet tested it with the latest grails, but I understand it keeps the plugins not under the project but in a separate directory. Do let me know and I'll try it out.
I don't know what the plugin is really giving you over using JAI directly, IMHO it isn't doing much.
I use ImageMagick out of process for my image conversion and the results are superior to what can be done with JAI from what I have seen. Of course if your doing as much traffic as Amazon running out of process is not an option, however if you need to get to revenue as quickly as possible then you might want to consider what I've done.
I use apache-commons-exec to have a nice interface around handling opening an external process and reading data from std in and out. The only thing I'm using JAI for is to read the sizes of images.
try this one http://support-network.info/board/gel%C3%B6st-problem-mit-imagetools-getbytes-t3008.html
I'm trying to use a third-party java library within oracle. The library seems compatible with the same 1.4 version of the jvm that our Oracle 10g server hosts, since it runs fine outside of Oracle, so I feel like I should be able to get this to work. This library ends up making SOAP-based http requests, and I get class resolution errors when I run in Oracle.
Here's a line that shows the difference:
Class msgfact = Class.forName("com.sun.xml.messaging.saaj.soap.MessageFactoryImpl");
I tried to register these libraries into Oracle with the loadjava utility, and I got what I thought was a successful result:
C:\>loadjava -verbose -schema MYUSER -user MYUSER/MYPWD#dbinstance -force saaj-impl.jar
It looks like everything gets loaded, and I can see this MessageFactoryImpl class in that list. But then I try to run this line of code from Oracle SQL (inside another class I wrote and loaded with loadjava), this line throws a ClassNotFoundException (java.lang.ClassNotFoundException: com/sun/xml/messaging/saaj/soap/MessageFactoryImpl).
Then I went back and tried to add the "-resolve" switch at the loadjava command line. It acts like these saaj classes are getting registered, but they aren't resolving properly.
How can I successfully get these saaj classes into Oracle, or if for some reason Oracle already has these loaded, how can I convince my own code to successfully use the existing class?
FWIW, I already took the steps to make sure that the appropriate socket permissions were granted and my code can successfully make a generic http request to the target url. It just has trouble using the library's SOAP stack to make it happen.
EDIT:
Here is a sample of my loadjava result. This seems to be showing exactly what's failing, but I'm confused as to why these particular classes aren't being resolved when they seem to be handled properly in the pre-resolution steps. I've eliminated about 80% of the file here, but there are other classes that show the same class resolution issues.
arguments: '-verbose' '-schema' 'MYSCHEMA' '-user' 'MYSCHEMA/MYSCHEMA#actest' '-resolve' '-force' 'saaj-impl.jar'
[snip]
creating : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/EnvelopeFactory
loading : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/EnvelopeFactory
creating : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/GifDataContentHandler
loading : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/GifDataContentHandler
creating : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/JpegDataContentHandler
loading : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/JpegDataContentHandler
creating : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageFactoryImpl
loading : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageFactoryImpl
creating : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageImpl
loading : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageImpl
[snip]
resolving: class MYSCHEMA.com/sun/xml/messaging/saaj/soap/AttachmentPartImpl
resolving: class MYSCHEMA.com/sun/xml/messaging/saaj/soap/Envelope
resolving: class MYSCHEMA.com/sun/xml/messaging/saaj/soap/EnvelopeFactory
errors : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/EnvelopeFactory
ORA-29534: referenced object MYSCHEMA.com/sun/xml/messaging/saaj/soap/SOAPPartImpl could not be resolved
resolving: class MYSCHEMA.com/sun/xml/messaging/saaj/soap/GifDataContentHandler
resolving: class MYSCHEMA.com/sun/xml/messaging/saaj/soap/JpegDataContentHandler
resolving: class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageFactoryImpl
errors : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageFactoryImpl
ORA-29534: referenced object MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageImpl could not be resolved
errors : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageImpl
ORA-29534: referenced object MYSCHEMA.com/sun/xml/messaging/saaj/soap/impl/EnvelopeImpl could not be resolved
errors : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageImpl$1
ORA-29534: referenced object MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageImpl could not be resolved
skipping : class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageImpl$2
[snip]
The following operations failed
class MYSCHEMA.com/sun/xml/messaging/saaj/soap/EnvelopeFactory: resolution
class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageFactoryImpl: resolution
class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageImpl: resolution
class MYSCHEMA.com/sun/xml/messaging/saaj/soap/MessageImpl$1: resolution
[snip]
exiting : Failures occurred during processing
First of all, verify outside of Oracle that the class you are looking for is actually in that jar file. I expect it is, but it doesn't hurt to check.
Then, I would check what classes have been loaded and whether they have valid statuses.
SELECT object_name, dbms_java.longname(object_name), status
FROM user_objects
WHERE object_type='JAVA CLASS'
ORDER BY 1
You might want to limit this somewhat if there are a lot of classes, e.g.:
WHERE dbms_java.longname(object_name) LIKE '%MessageFactoryImpl'
If the class is not there, or it is there with the wrong package name, then the problem is with the loadjava command.
If the class is there but its status is INVALID, then check USER_ERRORS to see what the errors are. I don't recall if I've done dynamic class loading within Oracle, but I recall that static linking would give errors that implied a class didn't exist when it really existed but had errors.
New info after loadjava output posted
The loadjava output seems inconsistent with your attempt to find the class in the database. If it is being loaded but not resolved, it should still be listed, but with an INVALID status.
I got the JAR and tried it myself in an empty schema. The class loads but is invalid as expected:
dev> select object_name, dbms_java.longname(object_name),status
2 from user_objects
3 where object_name like '%MessageFactoryImpl';
OBJECT_NAME
--------------------------------------------------------------------------------
DBMS_JAVA.LONGNAME(OBJECT_NAME)
--------------------------------------------------------------------------------
STATUS
-------
/3e484eb0_MessageFactoryImpl
com/sun/xml/messaging/saaj/soap/MessageFactoryImpl
INVALID
I then checked what the error were on the class:
dev> alter java class "com/sun/xml/messaging/saaj/soap/MessageFactoryImpl" resolve;
dev> /
Warning: Java altered with compilation errors.
dev> show error
Errors for JAVA CLASS "/3e484eb0_MessageFactoryImpl":
LINE/COL ERROR
-------- -----------------------------------------------------------------
0/0 ORA-29521: referenced name javax/xml/soap/MessageFactory could
not be found
0/0 ORA-29521: referenced name javax/xml/soap/SOAPMessage could not
be found
0/0 ORA-29521: referenced name javax/xml/soap/MimeHeaders could not
be found
0/0 ORA-29521: referenced name javax/xml/soap/SOAPException could not
be found
(These errors would also be listed in USER_ERRORS, assuming resolution was attempted at least once.)
So clearly this class references classes from the base SOAP library. You would have to load that too -- have you done that?
FYI, when I write some code to do the Class.forName() call, I do get the ClassNotFoundException. Which may seem counter-intuitive since the class object does exist in the schema. However, an invalid class doesn't really "exist" from the point of view of the class loader in Oracle; and in order for the class to be valid Oracle has to be able to resolve all of its references to other classes.
Is this the first time your executing Java on the database? Here is hello world implementation to make sure your Oracle JVM is running properly and you have the necessary permissions. You said "my database schema, so I can do whatever I want" -doesn't mean you have the proper grants.
SQL> create or replace and compile java source named "Hello" as
public class Hello{
public static String world() {
return "Hello World ";
}
};
/
Java created.
Now the wrapper function
SQL> create or replace function Hello RETURN VARCHAR2
as LANGUAGE JAVA NAME 'Hello.world() return String';
/
Function created.
Now test it
SQL> select Hello from dual;
HELLO
-----------------------------------
Hello World
Do this:
try
{
System.out.println("Class.forName returned: " +
Class.forName("com.sun.xml.messaging.saaj.soap.MessageFactoryImpl"));
}
catch(final Throwable ex)
{
ex.printStackTrace();
System.exit(1);
}
Just to be 100and10% sure that it is not throwing an exception that is somehow being hidden and that it is really returning null. If it is still the case please let me know (interesting problem if the code above works, but returns null).
Try # 3 :-) (I don't use Oracle... but this is a neat problem to debug...)
Does the info here on Class.forName in Oracle help?
http://download.oracle.com/docs/cd/B14117_01/java.101/b12021/appover.htm#i1006547
This presents as a ClassLoader issue, so hoepfully the solution is along the same lines as what happens in the "real, non-Oracle" world :-)
Edit... another try...
Ok looking at it some more... what is the output of the following:
System.out.println("vm vendor: " + System.getProperty("java.vendor"));
System.out.println("vm version: " + System.getProperty("java.version"));
System.out.println("class version: " + System.getProperty("java.class.version"));
I am wondering if there is an issue with the class file version - do the class files have a version that cannot be run on the Oracle VM?
Class resolution and loading are complex operations handled by the VM. The algorithm to be used by these 2 operations as described in the spec is left open for VM implementors.
My feeling is that in your case the resolution works as the operation checks only the availability of the class itself, while it is failing later when trying to effectively load the class (most probably due to missing dependencies: when loading the class, the VM needs to resolve at least all direct references to other classes).
You'll have to make sure that all classes are available to Oracle and performing a quick Google search for ORA-29534 shows tons of people having this problem (and I'm pretty sure somebody figured it out).
./alex
The saaj-impl.jar is part of the SAAJ component of the Web Services Developer Pack. It has dependencies on other JARs that ship with SAAJ, for instance, it definitely depends on saaj-api.jar and activation.jar, to my knowledge. Of course, saaj-api.jar is bound to depend on a lot of other JARs as well.
As far as JWSDP 1.5 is concerned, you could find the information in JWSDP 1.5 Release Notes to be useful. JWSDP 1.6 has different JARs in SAAJ I havent found the JWSDP 2.0 Release Notes to be particularly useful in this regard. BTW, JWSDP 2.0 would have different JARs to be placed in the classpath; so the scope of your problem eventually depends on the version of saaj-impl.jar that you use.
Just in case you might need it, some documentation is already available on how to load the SOAP client JARs into an Oracle database and to utilize them, in the following pages. I presume these to be different from the SAAJ JARs that comes with your library though.
Calling a webservice from the database.
How to install the SOAP client stack in the Oracle database.
Install JAR files in the database