JarFile::getInputStream can fail with NPE accessing ze.getName()

Summary

Clarify the javadoc for ZipFile::getInputStream and JarFile::getInputStream to indicate that null is returned for the InputStream if the specified ZipEntry does not exist within the Jar/Zip file

Problem

The javadoc never defined the behavior when the specified Zip/JarEntry does not exist in the Zip/Jar

Solution

Clarify the javadoc to indicate the longstanding behavior

Specification

The javadoc for ZipFile::getInputStream and JarFile::getInputStream will be modified to indicate a null will be returned when the ZipEntry does not exist within the Jar/Zip file:

 cat ZipDiffs.txt 
diff --git a/src/java.base/share/classes/java/util/jar/JarFile.java b/src/java.base/share/classes/java/util/jar/JarFile.java
index 050e93aa48b..b014c18f466 100644
--- a/src/java.base/share/classes/java/util/jar/JarFile.java
+++ b/src/java.base/share/classes/java/util/jar/JarFile.java
@@ -826,7 +826,8 @@ public class JarFile extends ZipFile {
      * zip file entry.
      * @param ze the zip file entry
      * @return an input stream for reading the contents of the specified
-     *         zip file entry
+     *         zip file entry or null if the zip file entry does not exist
+     *         within the jar file
      * @throws ZipException if a zip file format error has occurred
      * @throws IOException if an I/O error has occurred
      * @throws SecurityException if any of the jar file entries
diff --git a/src/java.base/share/classes/java/util/zip/ZipFile.java b/src/java.base/share/classes/java/util/zip/ZipFile.java
index a3c38acef91..1bef27986a3 100644
--- a/src/java.base/share/classes/java/util/zip/ZipFile.java
+++ b/src/java.base/share/classes/java/util/zip/ZipFile.java
@@ -345,7 +345,8 @@ public class ZipFile implements ZipConstants, Closeable {
      *
      * @param entry the zip file entry
      * @return the input stream for reading the contents of the specified
-     * zip file entry.
+     * zip file entry or null if the zip file entry does not exist
+     * within the zip file.
      * @throws ZipException if a ZIP format error has occurred
      * @throws IOException if an I/O error has occurred
      * @throws IllegalStateException if the zip file has been closed