#342 DrJava has main method but keeps saying do not have for every file

2018-05-19T17:32:30.778000Z

I cannot reproduce this, but we have a bug report with the same stack trace, so this is definitely an issue:
https://sourceforge.net/p/drjava/bugs/968/

It looks like it has something to do with saving the file. Have you tried making sure the file is saved before you try to run it?

DrJava has main method but keeps saying do not have for every file

2018-05-19T15:21:43.014000Z

Hello I really need help!

I am using Windows 10, latest DrJava and JDK as Java SE Development Kit 8u171

Dr Java was working fine but now can comply some of the code files I did which were all compiled and ran perfectly. They all show the same message as following. Those code files do not have other methods other than main methods.

Welcome to DrJava. Working directory is C:\Users\Fatoumata\Dropbox\Assignment\code

run Practice1
Static Error: This class does not have a static void main method accepting String[].

At first I thought it was my Mac then I switched to my Windows pc, but same error, then I thought it is my java environment problem, I uninstalled and installed again JDK and DrJava but problem did not solve. When I created methods, it shows error message-please see attachment. Could you please tell me how should I solve these problems? Because now I can not do any practice. Thank you.

My DrJava shows error message as following

java.lang.NullPointerException: peer
at sun.awt.windows.WInputMethod.openCandidateWindow(Native Method)
at sun.awt.windows.WInputMethod.access$400(Unknown Source)
at sun.awt.windows.WInputMethod$1.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.WaitDispatchSupport$2.run(Unknown Source)
at java.awt.WaitDispatchSupport$4.run(Unknown Source)
at java.awt.WaitDispatchSupport$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.WaitDispatchSupport.enter(Unknown Source)
at java.awt.Dialog.show(Unknown Source)
at javax.swing.JFileChooser.showDialog(Unknown Source)
at javax.swing.JFileChooser.showSaveDialog(Unknown Source)
at edu.rice.cs.drjava.ui.MainFrame.getSaveFile(MainFrame.java:4671)
at edu.rice.cs.drjava.ui.MainFrame$8.getFile(MainFrame.java:415)
at edu.rice.cs.drjava.model.AbstractGlobalModel$ConcreteOpenDefDoc.saveFileAs(AbstractGlobalModel.java:3257)
at edu.rice.cs.drjava.model.AbstractGlobalModel$ConcreteOpenDefDoc.saveFile(AbstractGlobalModel.java:3212)
at edu.rice.cs.drjava.model.AbstractGlobalModel.saveAllFilesHelper(AbstractGlobalModel.java:1577)
at edu.rice.cs.drjava.model.AbstractGlobalModel.saveAllFiles(AbstractGlobalModel.java:1554)
at edu.rice.cs.drjava.ui.MainFrame._saveAll(MainFrame.java:5327)
at edu.rice.cs.drjava.ui.MainFrame$ModelListener._saveAllBeforeProceeding(MainFrame.java:9812)
at edu.rice.cs.drjava.ui.MainFrame$ModelListener.saveBeforeCompile(MainFrame.java:9728)
at edu.rice.cs.drjava.model.GlobalEventNotifier.saveBeforeCompile(GlobalEventNotifier.java:437)
at edu.rice.cs.drjava.model.compiler.CompilerEventNotifier.saveBeforeCompile(CompilerEventNotifier.java:106)
at edu.rice.cs.drjava.model.compiler.DefaultCompilerModel._prepareForCompile(DefaultCompilerModel.java:230)
at edu.rice.cs.drjava.model.compiler.DefaultCompilerModel.compileAll(DefaultCompilerModel.java:171)
at edu.rice.cs.drjava.ui.MainFrame._compileAll(MainFrame.java:5752)
at edu.rice.cs.drjava.ui.MainFrame.access$5300(MainFrame.java:132)
at edu.rice.cs.drjava.ui.MainFrame$55.actionPerformed(MainFrame.java:973)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

System Properties:
DrJava Version drjava-20160913-225446
DrJava Build Time 20160913-225446

drjava.debug.port = 51768
java.runtime.name = Java(TM) SE Runtime Environment
sun.boot.library.path = C:\Program Files\Java\jre1.8.0_171\bin
java.vm.version = 25.171-b11
user.country.format = CA
java.vm.vendor = Oracle Corporation
java.vendor.url = http://java.oracle.com/
path.separator = ;
java.vm.name = Java HotSpot(TM) 64-Bit Server VM
file.encoding.pkg = sun.io
user.country = FR
user.script =
sun.java.launcher = SUN_STANDARD
sun.os.patch.level =
java.vm.specification.name = Java Virtual Machine Specification
user.dir = <anonymized user.home="">\Desktop
java.runtime.version = 1.8.0_171-b11
java.awt.graphicsenv = sun.awt.Win32GraphicsEnvironment
java.endorsed.dirs = C:\Program Files\Java\jre1.8.0_171\lib\endorsed
os.arch = amd64
java.io.tmpdir = C:\Users\FATOUM~1\AppData\Local\Temp\ line.separator = "\u000d\u000a"
java.vm.specification.vendor = Oracle Corporation
user.variant =
os.name = Windows 10
sun.jnu.encoding = Cp1252
java.library.path = C:\Program Files\Java\jre1.8.0_171\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;<anonymized user.home="">\AppData\Local\Microsoft\WindowsApps;;C:\Program Files\Java\jre1.8.0_171\bin;.
sun.awt.enableExtraMouseButtons = true
java.specification.name = Java Platform API Specification
java.class.version = 52.0
sun.management.compiler = HotSpot 64-Bit Tiered Compilers
os.version = 10.0
user.home = <anonymized user.home="">
user.timezone = America/New_York
java.awt.printerjob = sun.awt.windows.WPrinterJob
file.encoding = Cp1252
java.specification.version = 1.8
java.class.path = <anonymized user.home="">\Desktop\drjava-beta-20160913-225446.exe
user.name = <anonymized user.name="">
java.vm.specification.version = 1.8
sun.java.command = <anonymized user.home="">\Desktop\drjava-beta-20160913-225446.exe
java.home = C:\Program Files\Java\jre1.8.0_171
sun.arch.data.model = 64
user.language = fr
java.specification.vendor = Oracle Corporation
user.language.format = en
awt.toolkit = sun.awt.windows.WToolkit
java.vm.info = mixed mode
java.version = 1.8.0_171
java.ext.dirs = C:\Program Files\Java\jre1.8.0_171\lib\ext;C:\WINDOWS\Sun\Java\lib\ext
sun.boot.class.path = C:\Program Files\Java\jre1.8.0_171\lib\resources.jar;C:\Program Files\Java\jre1.8.0_171\lib\rt.jar;C:\Program Files\Java\jre1.8.0_171\lib\sunrsasign.jar;C:\Program Files\Java\jre1.8.0_171\lib\jsse.jar;C:\Program Files\Java\jre1.8.0_171\lib\jce.jar;C:\Program Files\Java\jre1.8.0_171\lib\charsets.jar;C:\Program Files\Java\jre1.8.0_171\lib\jfr.jar;C:\Program Files\Java\jre1.8.0_171\classes
java.vendor = Oracle Corporation
file.separator = \ java.vendor.url.bug = http://bugreport.sun.com/bugreport/
sun.io.unicode.encoding = UnicodeLittle
sun.cpu.endian = little
java.rmi.server.hostname = 127.0.0.1
sun.desktop = windows
sun.cpu.isalist = amd64

DrJava configuration file
In resource bundle edu.rice.cs.drjava.config.options:
nothing

In shadowed configuration:
lineenum.enabled = true
key.delete.next = [shift DELETE]
key.delete.previous = [shift BACK_SPACE]
save.before.compile = true
recent.files = [C:\Users\<anonymized user.name="">\Dropbox\Assignment\code\Practice1.java,C:\Users\<anonymized user.name="">\Dropbox\Assignment\code\Practice2.java,C:\Users\<anonymized user.name="">\Dropbox\Assignment\code\While.java,C:\Users\<anonymized user.name="">\Dropbox\Assignment\code\Multiple.java,C:\Users\<anonymized user.name="">\Dropbox\Assignment\code\Echo1.java]
window.height = 744
window.width = 1382
window.x = -8
window.y = -8
window.state = 6
last.dir = C:\Users\<anonymized user.name="">\Desktop\code\ThreeInteger.java
last.interactions.dir = C:\Users\<anonymized user.name="">\Desktop\code
tabbedpanes.state = 683 384 700 400
new.version.notification.last = 1526685603679
file.ext.registration = always

Used memory: about 45.74 megabytes
Free memory: about 121.76 megabytes
Total memory: about 167.50 megabytes
Total memory can expand to: about 1.74 gigabytes

Number of processors/cores: 8

Compiler Discovery Log:

Recent changes to 342: DrJava has main method but keeps saying do not have for every file

#342 DrJava has main method but keeps saying do not have for every file

DrJava has main method but keeps saying do not have for every file