Update `JarFile` so that the `close()` method no longer closes nested
jars or the wrapper. Prior to this commit it was possible for a parent
jar file to be garbage collected and closed even though references still
existed to the nested jars. When this happened the nested jars would get
closed and any access to entries would result in `JarFile.ensureOpen()`
throwing an `IllegalStateException`. The user would often not see this
exception directly, but rather find `ClassNotFoundException` being
thrown.
Fixes gh-31853
Update `JarFile` and related classes so that `close()` is not longer
called early.
Prior to this commit, we would always immediately close the underlying
jar file to prevent file locking issues with our build. This causes
issues on certain JVMs when they attempt to verify a signed jar.
The file lock issues have now been solved by returning a custom input
stream from `JarUrlConnection` which captures and delegates the close
method.
Fixes gh-29356
Update `JarURLConnection` to use a single shared wrapper per
jar file rather than creating a new one each time. This update
should help to reduce GC pressure.
Fixes gh-28042
Previously, a Zip64 jar file was identified by the number of entries
in the central directory being 0xFFFF. This value indicates that
there the number of entries is too big for the 2-byte field. However,
a jar may be in Zip64 format due to it exceeding the Zip format's
maximum size rather than its maximum number of entries so this field
cannot be used as a reliable indicator. The Zip specification doesn't
require any of the fields of the end of central directory record to
have a value of 0xFFFF (2-byte fields) or 0xFFFFFFFF (4-byte fields)
when using Zip64 format so we need to take a different approach.
Additionally, a number of places in the code assumed that an entry's
offset would always be available from the central directory file
header directly. This assumption did not hold true when the jar was
a Zip64 archive due to its size as the offset's value would be
0xFFFFFFF indicating that it should be read from the Zip64 extended
information field within the header's extra field instead.
This commit updates the Zip64 detection to look for the Zip64 end of
central directory locator instead. If present, it begins 20 bytes
before the beginning of the end of central directory record. Its
first four bytes are always 0x07064b50. The code that reads the
local header offset has also been updated to refer to the Zip64
extended information field when the offset is too large to fit in
the 4-byte field in the central directory file header. To allow
greater-than-4-byte offsets to be handled, a number of fields,
method parameters, and local variables have had their type changed
from an int to a long.
Fixes gh-27822
Update `JarFile` and `JarFileWrapper` classes so that they no longer
close the `JarFile` early if a `SecurityManager` is in use.
Prior to this commit, the closed `JarFile` would cause (an ultimately
swallowed) NPE in `ZipFile` which manifested itself as a
`ClassNotFoundException` when starting the app.
Closes gh-25538
