Develop Reference

Android: Class in source code not found

I am trying to access the PhoneInterfaceManager.java on android.
As it is not part of the sdk, I need to use reflection. (I know I shouldn't do this, but as far as I know there is no other way).
The full name of the class is "com.android.phone.PhoneInterfaceManager".
Now when I run this code...
Object getPhoneInterfaceManager() throws ClassNotFoundException{
return Class.forName("com.android.phone.PhoneInterfaceManager");
}
...I get:
java.lang.ClassNotFoundException: com.android.phone.PhoneInterfaceManager
Note:
I checked the grep repository (which I find to be more reliable sometimes) and noticed that while the package for classes which worked with reflection were in the project "com.google.android / android", this class was to be found in "com.google.android / android-apps ". I don't know if this might mean something, but I thought I'd mention it anyway.
Thanks for your help in advance!

Java/Android - Crash - Apache commons-io-2.4.jar

I am trying to save values in a string to a file on my local system by using the org.apache.commons.io.FileUtils static method writeStringToFile.
So, first I downloaded the commons-io-2.4.jar, along with its javadocs and source and imported it into my Eclipse project through the Java Build Path. Everything compiles just fine.
However, when I add the simple line:
org.apache.commons.io.FileUtils.writeStringToFile(new java.io.File(Environment.getExternalStorageDirectory().toString() + "/logt.txt"), rslt.toString());
The program crashes. But, it doesn't crash anywhere near that statement. Instead, it crashes at the constructor of the Object which contains the method which calls this function.
In other words
Earlier in my code I create an object TranslateTask,
Which happens to contain a function call doTranslate().
The writeStringToFile call is made within the doTranslate() call,
However the actual crash takes place when I instantiate a TranslateTask object.
But, when I comment out the call to writeStringToFile(), the crash never happens
Even though the crash doesn't take place in the doTranslate() call...
So, just the mere mention of writeStringToFile() makes my program crash when I instantiate an object which contains it.
To make it more eary, I instantiate the object within a Try, catch (RejectedExecutionException e) block but instead the program crashes at this part:
PathClassLoader.findClass(String) line: 243 **Last call in the stack**
PathClassLoader(ClassLoader).loadClass(String, boolean) line: 573
PathClassLoader(ClassLoader).loadClass(String) line: 532
Translate$4.run() line: 159 **Crash happens here where I instantiate a TranslateTask object**
So PathClassLoader... Not sure how to approach debugging this. All I know is that if I commend out the org.apache.commons.io.FileUtils.writeStringToFile() call, the error never happens and the code runs fine everywhere.
Running this on the API8/10 of Android, using Eclipse Indigo.
EDIT- Logcat:
08-07 18:40:11.409: I/System.out(1395): debugger has settled (1363)
08-07 18:40:14.399: W/KeyCharacterMap(1395): No keyboard for id 0
08-07 18:40:14.399: W/KeyCharacterMap(1395): Using default keymap:
/system/usr/keychars/qwerty.kcm.bin
Don't think it gives any hint, but this is all that logcat gives after the debugger has settled.
EDIT2 -
For good measure, I just added
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
But still no go
EDIT3 -
I am starting to think the apache commons-io-2.4.jar doesn't work with Android inherently. Could that be it?
EDIT4 -
In case anyone wants to take a crack at it, here is my code. It is made in Windows 7, Eclipse Indigo. The code is based on the "Hello Android" translate section. All I am trying to do is extract some JSON into a string and save it into my sdcard. But, it has evolved into this mystery here...
https://dl.dropbox.com/u/10790286/Translate.zip (See TranslateTask.java line 111)
EDIT5 -
Interesting update. When I manually put FileUtils.writeStringToFile(new java.io.File("/mnt/sdcard/logt.txt"), "test"); into the eclipse expressions box during a debug, I get the following error
An exception occurred: java.lang.NoSuchMethodError
I don't understand why I would get this error because 1) the WriteStringToFile() function is in the commons-io source. 2) I can instantiate a FileUtils object 3) I imported it into my program.
Whats going on here?

Writing to the path "c:\\temp\\logt.txt" isn't going to work on Android. You can use something like Environment.getExternalStorageDirectory().toString() + "/log.txt" to write to the SD card.
EDIT:
The follow worked on my Galaxy Nexus:
try {
FileUtils.writeStringToFile(new File(Environment.getExternalStorageDirectory(),"log2.txt"), "HelloNow");
} catch (IOException e) {
Log.e(TAG,e.getMessage())
}

Though the programme runs succesfully in complier ,the programme crashes while it runs in android device .Because during the run time it checks over jar files within android dependancies only. I too had similar type of problem .I got it solved when in preferences/properties -> java build .Tick the external jar file .

Syntax error on token "Invalid Character", delete this token

I am not sure why is it giving this error. Braces seem to be right. Another thing is that the same program works in Windows-eclipse but not in eclipse for Mac. What could be the reason?
import java.util.Vector;
public class Debug
{
private int something = 0;
private Vector list = new Vector();
public void firstMethod()
{
thirdMethod(something);
something = something + 1;
}
public void secondMethod()
{
thirdMethod(something);
something = something + 2;
}
public void thirdMethod(int value)
{
something = something + value;
}
public static void main(String[] args)
{
Debug debug = new Debug();
debug.firstMethod();
debug.secondMethod();
}
}

Ah, ok - it's probably a control-Z or other unprintable character at the end of the file that is ignored in Windows but not on the Mac. You copied the source from Windows to the Mac. Delete the last few characters and re-enter them - I think it will go away. I don't do Mac, though - I'm just guessing.

I had the same problem importing my projects from mac to linux Slackware.
Mac OSX creates some temporary files with the same name of the files in folders (._filename) in all folders.
Usually these files are invisible in Mac OSX, but in the other OSs no.
Eclipse can find these files and tries to handle like sources (._filename.java).
I solved deleting these files.

Only way i could resolve this problem was press Ctrl+A to select all text of file then Ctrl+C to copy them then delete file and create new class with intellij idea then Ctrl+P to paste text in new file. this resolve my problem and compiler never show error after do this solution.

It can happen when we copy and paste .It happens when there may be some character which is unrecognized in one platform but recognized in other.
I would suggest don't copy rather try to write the entire code by yourself. It should work

I got the same error when I imported a project I created in a Mac, to Windows. As #Massimo says Mac creates ._filename,java files which eclipse running in windows consider as source files. This is what causes the problem.
They are hidden files, which you can see when you select the option, "Show hidden files and folders" under folder options in Windows machine. Deleting these files solves the problem.

I got this message trying to call a subjob from a tRunJob component. In the tRunJob I had both checked "transmit whole context" AND listed individual parameters in the parameters/values box. Once I removed the additional parameters it worked.

There are probably hidden characters in the line. If you move your cursor through the characters and your cursor doesn't move in one character, that means there is an invalid character in the line. Delete those and it should work. Also try copying and pasting the line to an hex editor and you will see the invalid characters in it.

i face this problem many times in eclipse . What i found is that select all code - cut it using Ctrl + x and then save the file and again paste the code using Ctrl + V . This works for me many times when i copy the code from another editor.

I also faced similar issue while copying the code from one machine to another.
The issue was with Space only you need to identify the red mark in your eclipse code.

On Windows, if you copy the source to Notepad - save the file (as anything), ensuring ASCI encoding is selected - the character will be converted to a question-mark which you can then delete - then copy the code back to Eclipse.

In eclipse right click on the file -> Properties -> resources
In Text file encoding select US-ASCII
This way you will see all the special char, you can then find & replace
And then format the code

Another Netbeans issue | cannot find symbol method, but correctly declared

this has been a crappy day, besides the IDE not compiling/deploying because of this bug and waisting valuable time, I finally get it to deploy it suddenly I start getting this weird message (after compiling and running it several times):
T:\Users\Triztian\Documents\RHT System\RHTUBSDB\src\java\controllers\OrderSearch.java:64: cannot find symbol
symbol : method metadata(java.lang.Long)
location: class BO.CoverForm
OrderExtraInfoDTO foundInformation = frmCover.metadata(foundOrder.getReferenceNumber());
it is my understanding that this means that my method isn't declared, but thats not the situation as my method is clearly declared and coded.
CoverForm.java:
public OrderExtraInfoDTO metadata(Long ReferenceNumber) {
OrderExtraInfoDTO foundInformation = new OrderExtraInfoDTO();
try{
foundInformation = lnkAddInformation.fetchInformation(ReferenceNumber);
} catch (DAOException daoe) {
this.setError("additional_information", daoe.getMessage());
}
return foundInformation;
}
And the servlet that calls the CoverForm.java method.
OrderSearch.java (Extends HttpServlet):
CoverDTO foundCover = frmCover.search(foundOrder.getReferenceNumber());
OrderExtraInfoDTO foundInformation = frmCover.metadata(foundOrder.getReferenceNumber());
UpgradesDTO foundUpgrades = frmUpgrades.search(foundOrder.getReferenceNumber());
I've tried renaming the method and didn't have any success, any help is truly appreciated as I'm getting frustrated with NB 6.9.1 because of some crashes and another weird bug (might catch an entomologist's attention) which locks the editor and displays a message saying: "Refactoring cannot be done in the given context" whenever I press delete, forcing me to restart the IDE.
EDIT
Ok, so I've removed the classes that I posted and merged them in a more appropriate place, however I still get that silly symbol not found error but on a different symbol(another method) this time.

Netbeans 6.9.1 is a very robust IDE. You may run into problems like the one you mention above, if:
You run your NB without enough disk space available. Make sure that you have at least 2 GB free on your file system for the necessary temporary files.
You have a very large number of projects active in your project space. Reduce this number to just the needed projects, by deleting and reopening more often.
Hope this helps ...

Matlab + Java: java.lang.ExceptionInInitializerError when trying to use javabuilder

I've been trying to use Matlab's javabuilder package under Windows XP, but I'm getting a strange error when trying to instantiate any javabuilder class. To illustrate the problem, I've created a simple program that prints the MCRROOT and PATH system variables (to check if they're correctly set) and tries to create a MWCharArray:
import com.mathworks.toolbox.javabuilder.*;
import com.mathworks.toolbox.javabuilder.internal.MCRConfiguration;
class Main
{
public static void main(String[] args)
{
System.out.println("MCRROOT: " + System.getenv("MCRROOT"));
System.out.println("PATH: " + System.getenv("PATH"));
System.out.println(MCRConfiguration.isInstalledMCR());
MWCharArray test = new MWCharArray("Test");
}
}
When I execute the program, the output is:
MCRROOT: C:\Program files\MATLAB\MATLAB Compiler Runtime\v710
PATH: C:\Program files\CollabNet Subversion Client;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program files\MATLAB\MATLAB Compiler Runtime\v710
false
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getMCRRoot(MCRConfiguration.java:77)
at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$ModuleDir.<clinit>(MCRConfiguration.java:51)
at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration.getModuleDir(MCRConfiguration.java:56)
at com.mathworks.toolbox.javabuilder.internal.MWMCR.<clinit>(MWMCR.java:1447)
at com.mathworks.toolbox.javabuilder.MWUtil.GetUnknownClassID(MWUtil.java:1258)
at com.mathworks.toolbox.javabuilder.MWClassID.<clinit>(MWClassID.java:41)
at com.mathworks.toolbox.javabuilder.MWCharArray.<init>(MWCharArray.java:75)
at Main.main(Main.java:11)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(String.java:1937)
at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.get(MCRConfiguration.java:70)
at com.mathworks.toolbox.javabuilder.internal.MCRConfiguration$MCRRoot.<clinit>(MCRConfiguration.java:72)
... 8 more
Java Result: 1
First of all, are MCRROOT's and PATH's values correct? I've tried google for finding out how to set MCRROOT, but there are conflicting results: some sources say that I should include de version dir, others say the opposite. Also, why is the isInstalledMCR method returning false? I've double-checked the MCR installation (and even uninstalled and installed it to be sure), so why isn't the library finding it?
Thanks on advance for any help!
Edit: I've also tried setting MCRROOT with no version string, and it also fails.

Just wild guessing! Java is messing around with strings, while your 'mcrroot' contains white spaces. I might change the mcr install path to something like C:\MATLAB\MATLABCompilerRuntime\v710, omitting any white spaces and special characters.

I've found the solution, so I'm post a self answer for future reference: Besides adding the javabuilder.jar to the program's classpath, you also have to add the path to the MCR's runtime libraries to the java.library.path JDK parameter.
My mistake was that, instead of setting the path as the path to the libraries at the MCR installation directory (On my case, C:\MATLAB\MCR\v710\runtime\win32), I copied the runtime directory to my project's dir and used it instead. It seems that the javabuilder library uses the java.library.path variable the guess the MCROOT, what would explain the weird "StringIndexOutOfBoundsException".