FULL PRODUCT VERSION :
java version "1.8.0-ea"
Java(TM) SE Runtime Environment (build 1.8.0-ea-b103)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b45, mixed mode)

Same behaviour in 1.7.0_25.

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.2.9200]
(Windows 8)

A DESCRIPTION OF THE PROBLEM :
During annotation processing I traverse Element trees using Element.getEnclosedElements and DeclaredType.asElement(). For some Elements javac crashes with the following message:

error: cannot access StringPrep
  class file for sun.net.idn.StringPrep not found
  Consult the following stack trace for details.
  com.sun.tools.javac.code.Symbol$CompletionFailure: class file for sun.net.idn.StringPrep not found


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Here is a source code example that reproduces the failure (3 classes, run Main).

1. Main

package completion_failure;
import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.annotation.processing.Processor;
import javax.tools.JavaCompiler;
import javax.tools.JavaCompiler.CompilationTask;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;

public class Main
{
public static void main(String[] args)
  {
List<String> options = new ArrayList<>();

options.add("-proc:only");

List<String> annotationProcessors = new ArrayList<>();
annotationProcessors.add(AnnotationProcessor.class.getName());

JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

StandardJavaFileManager fileManager =
compiler.getStandardFileManager(null, null, null);

List<JavaFileObject> compilationUnits = new ArrayList<>();
File file = new File("src/test/java/completion_failure/AnnotatedType.java");
List<File> files = new ArrayList<>();
files.add(file);
compilationUnits.add(
fileManager.getJavaFileObjectsFromFiles(files).iterator().next());

CompilationTask compilationTask =
compiler.getTask(
null,
fileManager,
null,
options,
null,
compilationUnits);

List<Processor> processors = new ArrayList<>();
processors.add(new AnnotationProcessor());

compilationTask.setProcessors(processors);

compilationTask.call();
}
}

2. Annotation Processor

package completion_failure;
import java.util.HashSet;
import java.util.Set;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;


@SupportedSourceVersion(SourceVersion.RELEASE_7)
@SupportedAnnotationTypes("java.lang.SuppressWarnings")
public class AnnotationProcessor extends AbstractProcessor
{
private Set<Element> elements = new HashSet<>();

public Set<Element> getElements()
{
return elements;
}

private void populateElements(Element element, int depth)
{
if (elements.add(element))
{
TypeMirror mirror = element.asType();

System.out.println(
new String(new char[depth]).replace("\0", " ") +
mirror.toString() + " " + element.getSimpleName());

for (Element enclosedElement : element.getEnclosedElements())
{
populateElements(enclosedElement, depth + 1);
}

if (mirror instanceof DeclaredType)
{
DeclaredType declaredType = (DeclaredType) mirror;
populateElements(declaredType.asElement(), depth + 1);
}
}
}

@Override
  public boolean process(
  Set<? extends TypeElement> annotations, RoundEnvironment roundEnv)
  {
System.out.println("starting processing round");

if (false == roundEnv.processingOver())
{
populateElements(roundEnv.getRootElements().iterator().next(), 0);
}

return false;
  }
}

3. Annotated Element:

package completion_failure;
import java.net.IDN;

public class AnnotatedType
{
@SuppressWarnings("unused")
  private IDN idn;
}

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
no error
ACTUAL -
error


ERROR MESSAGES/STACK TRACES THAT OCCUR :
error: cannot access StringPrep
  class file for sun.net.idn.StringPrep not found
  Consult the following stack trace for details.
  com.sun.tools.javac.code.Symbol$CompletionFailure: class file for sun.net.idn.StringPrep not found

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
Here is a source code example that reproduces the failure (3 classes, run Main).

1. Main

package completion_failure;
import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.annotation.processing.Processor;
import javax.tools.JavaCompiler;
import javax.tools.JavaCompiler.CompilationTask;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;

public class Main
{
public static void main(String[] args)
  {
List<String> options = new ArrayList<>();

options.add("-proc:only");

List<String> annotationProcessors = new ArrayList<>();
annotationProcessors.add(AnnotationProcessor.class.getName());

JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

StandardJavaFileManager fileManager =
compiler.getStandardFileManager(null, null, null);

List<JavaFileObject> compilationUnits = new ArrayList<>();
File file = new File("src/test/java/completion_failure/AnnotatedType.java");
List<File> files = new ArrayList<>();
files.add(file);
compilationUnits.add(
fileManager.getJavaFileObjectsFromFiles(files).iterator().next());

CompilationTask compilationTask =
compiler.getTask(
null,
fileManager,
null,
options,
null,
compilationUnits);

List<Processor> processors = new ArrayList<>();
processors.add(new AnnotationProcessor());

compilationTask.setProcessors(processors);

compilationTask.call();
}
}

2. Annotation Processor

package completion_failure;
import java.util.HashSet;
import java.util.Set;

import javax.annotation.processing.AbstractProcessor;
import javax.annotation.processing.RoundEnvironment;
import javax.annotation.processing.SupportedAnnotationTypes;
import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.element.Element;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;


@SupportedSourceVersion(SourceVersion.RELEASE_7)
@SupportedAnnotationTypes("java.lang.SuppressWarnings")
public class AnnotationProcessor extends AbstractProcessor
{
private Set<Element> elements = new HashSet<>();

public Set<Element> getElements()
{
return elements;
}

private void populateElements(Element element, int depth)
{
if (elements.add(element))
{
TypeMirror mirror = element.asType();

System.out.println(
new String(new char[depth]).replace("\0", " ") +
mirror.toString() + " " + element.getSimpleName());

for (Element enclosedElement : element.getEnclosedElements())
{
populateElements(enclosedElement, depth + 1);
}

if (mirror instanceof DeclaredType)
{
DeclaredType declaredType = (DeclaredType) mirror;
populateElements(declaredType.asElement(), depth + 1);
}
}
}

@Override
  public boolean process(
  Set<? extends TypeElement> annotations, RoundEnvironment roundEnv)
  {
System.out.println("starting processing round");

if (false == roundEnv.processingOver())
{
populateElements(roundEnv.getRootElements().iterator().next(), 0);
}

return false;
  }
}

3. Annotated Element:

package completion_failure;
import java.net.IDN;

public class AnnotatedType
{
@SuppressWarnings("unused")
  private IDN idn;
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
found none