codeql/change-notes/1.20/analysis-java.md

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# Improvements to Java analysis
## General improvements
## New queries
| **Query** | **Tags** | **Purpose** |
|-----------------------------|-----------|--------------------------------------------------------------------|
| Double-checked locking is not thread-safe (`java/unsafe-double-checked-locking`) | reliability, correctness, concurrency, external/cwe/cwe-609 | Identifies wrong implementations of double-checked locking that does not use the `volatile` keyword. |
| Race condition in double-checked locking object initialization (`java/unsafe-double-checked-locking-init-order`) | reliability, correctness, concurrency, external/cwe/cwe-609 | Identifies wrong implementations of double-checked locking that performs additional initialization after exposing the constructed object. |
## Changes to existing queries
| **Query** | **Expected impact** | **Change** |
|----------------------------|------------------------|------------------------------------------------------------------|
| Arbitrary file write during archive extraction ("Zip Slip") (`java/zipslip`) | Fewer false positive results | Results involving a sanitization step that converts a destination `Path` to a `File` are no longer reported. |
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| Double-checked locking is not thread-safe (`java/unsafe-double-checked-locking`) | Fewer false positive results and more true positive results | Results that use safe publication through a `final` field are no longer reported. Results that initialize immutable types like `String` incorrectly are now reported. |
| Result of multiplication cast to wider type (`java/integer-multiplication-cast-to-long`) | Fewer results | Results involving conversions to `float` or `double` are no longer reported, as they were almost exclusively false positives. |
## Changes to QL libraries
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* The deprecated library `semmle.code.java.security.DataFlow` has been removed.
Improved data flow libraries have been available in
`semmle.code.java.dataflow.DataFlow`,
`semmle.code.java.dataflow.TaintTracking`, and
`semmle.code.java.dataflow.FlowSources` since 1.16.
* Taint tracking now includes additional default data-flow steps through
collections, maps, and iterators. This affects all security queries, which
can report more results based on such paths.
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