Exception, when saving new PsiJavaFile

Just wrap that code inside a block like this:

ApplicationManager.getApplication().runWriteAction(
new Runnable() {
public void run() {
// your code here
}
);

Also, if you creating a new class from a template, you might want to take a look at the PsiDirectory.createClass(name, templateName) method.

Hello Andremoniy,

Actually the exception message gives you all the information that you need
to fix the problem. I'll repeat what it says in other words: You need to
wrap the operation you perform in ApplicationManager.getApplication().runWriteAction().

I'm creating new PsiJavaFile, using some template by calling method:
PsiJavaFile testPsiFile = (PsiJavaFile)
elementFactory.createFileFromText("some.java", templateContent);
VirtualFile testDirVF =
psiFile.getVirtualFile().getFileSystem().findFileByPath(someDir.getCan
onicalPath());

PsiDirectory psiDirectory = psiManager.findDirectory(testDirVF);

try {
psiDirectory.add(testPsiFile);
} catch (Exception e1) {
// ingore
}
So, the testFile is saving, but an internal error occused:

Assertion failed: Write access is allowed inside write-action only
(see com.intellij.openapi.application.Application.runWriteAction())
java.lang.Throwable
at com.intellij.openapi.diagnostic.Logger.assertTrue(Logger.java:89)
at
com.intellij.openapi.application.impl.ApplicationImpl.assertWriteAcces
sAllowed(ApplicationImpl.java:215)
at
com.intellij.openapi.editor.impl.DocumentImpl.a(DocumentImpl.java:162)
at
com.intellij.openapi.editor.impl.DocumentImpl.a(DocumentImpl.java:18)
at
com.intellij.openapi.editor.impl.DocumentImpl.replaceString(DocumentIm
pl.java:8)
at
com.intellij.openapi.editor.impl.DocumentImpl$5.run(DocumentImpl.java:
1)
at
com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(
CommandProcessorImpl.java:103)
at
com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(
CommandProcessorImpl.java:89)
at
com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(
CommandProcessorImpl.java:136)
at
com.intellij.openapi.editor.impl.DocumentImpl.setText(DocumentImpl.jav
a:153)
at
com.intellij.psi.impl.file.PsiDirectoryImpl.add(PsiDirectoryImpl.java:
292)
at
ru.andremoniy.plugins.idea.autoseleniumtest.AutoSeleniumTestProject.cr
eateTestFile(AutoSeleniumTestProject.java:152)
at
ru.andremoniy.plugins.idea.autoseleniumtest.AutoSeleniumTestProject.ac
cess$000(AutoSeleniumTestProject.java:35)
at
ru.andremoniy.plugins.idea.autoseleniumtest.AutoSeleniumTestProject$Ok
ButtonActionListener.actionPerformed(AutoSeleniumTestProject.java:104)
at
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:199
5)
at
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java
:2318)
at
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.
java:387)
at
javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonLi
stener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6041)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5806)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4413)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4243)
at
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at
java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2440)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:131)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:18)
at
com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:136)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThrea
d.java:273)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.j
ava:183)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThrea
d.java:173)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
java.lang.Throwable
at com.intellij.openapi.diagnostic.Logger.error(Logger.java:48)
at
com.intellij.openapi.editor.impl.DocumentImpl.b(DocumentImpl.java:68)
at
com.intellij.openapi.editor.impl.DocumentImpl.a(DocumentImpl.java:308)
at
com.intellij.openapi.editor.impl.DocumentImpl.replaceString(DocumentIm
pl.java:8)
at
com.intellij.openapi.editor.impl.DocumentImpl$5.run(DocumentImpl.java:
1)
at
com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(
CommandProcessorImpl.java:103)
at
com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(
CommandProcessorImpl.java:89)
at
com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(
CommandProcessorImpl.java:136)
at
com.intellij.openapi.editor.impl.DocumentImpl.setText(DocumentImpl.jav
a:153)
at
com.intellij.psi.impl.file.PsiDirectoryImpl.add(PsiDirectoryImpl.java:
292)
at
ru.andremoniy.plugins.idea.autoseleniumtest.AutoSeleniumTestProject.cr
eateTestFile(AutoSeleniumTestProject.java:152)
at
ru.andremoniy.plugins.idea.autoseleniumtest.AutoSeleniumTestProject.ac
cess$000(AutoSeleniumTestProject.java:35)
at
ru.andremoniy.plugins.idea.autoseleniumtest.AutoSeleniumTestProject$Ok
ButtonActionListener.actionPerformed(AutoSeleniumTestProject.java:104)
at
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:199
5)
at
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java
:2318)
at
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.
java:387)
at
javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonLi
stener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6041)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5806)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4413)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4243)
at
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at
java.awt.LightweightDispatcher.processMouseEvent(Container.java:3986)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2440)
at java.awt.Component.dispatchEvent(Component.java:4243)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:131)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:18)
at
com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:136)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThrea
d.java:273)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.j
ava:183)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThrea
d.java:173)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)

--
Dmitry Jemerov
Development Lead
JetBrains, Inc.
http://www.jetbrains.com/
"Develop with Pleasure!"

Hugo, Dmitry, thank you very much, it is really helpful answer.