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<p><strong>About</strong></p>
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<strong>Changes</strong></font>
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This page details the changes made in the current version only.
Earlier changes are detailed in the 
<a href="changes_history.html">
History of Previous Changes
Version 2.5
Summary of main changes
The HTTP implementation can now be selected at run-time, and JMeter now also supports Apache HttpComponents HttpClient 4.x.
Note that Commons HttpClient 3.1 is no longer actively developed, and support may be removed from JMeter in a future release.
The HTTP sampler now allows concurrent downloads of embedded resources in an HTML page
The HTTP Sampler can now report the size of a request before decompression.
The JMS and Mail samplers have been improved.
The new Test Fragment Test Element makes using Include Controllers easier
There are various improvements to the View Results Tree Listener
Bug 30563 - Thread Group should have a start next loop option on Sample Error
There are two new Thread Group types - setUp and tearDown - which are run before and after the main Thread groups.
Client-Server mode now supports external stop/shutdown via UDP
multiple JMeter server instances can be started on the same host without needing to change the port property.
Bug 50516 - "Host" header in HTTP Header Manager is not included in generated HTTP request
The Include Controller has some problems in non-GUI mode. 
In particular, it can cause a NullPointerException if there are two include controllers with the same name.
Once Only controller behaves correctly under a Thread Group or Loop Controller,
but otherwise its behaviour is not consistent (or clearly specified).
The menu item Options / Choose Language does not change all the displayed text to the new language.
[The behaviour has improved, but language change is still not fully working]
To override the default local language fully, set the JMeter property "language" before starting JMeter. 
Incompatible changes
Unsupported methods are no longer converted to GET by the Commons HttpClient sampler.
Removed method public static long currentTimeInMs().
This has been replaced by the instance method public long currentTimeInMillis().
ProxyControl.getSamplerTypeName() now returns a String rather than an int.
This is internal to the workings of the JMeter Proxy & its GUI, so should not affect any user code.
HTTP Samplers and Proxy
Bug 50178 - HeaderManager added as child of Thread Group can create concatenated HeaderManager names and OutOfMemoryException
Bug 50392 - value is trimmed when sending the request in Multipart
Bug 50686 - HeaderManager logging too verbose when merging instances
Bug 50963 - AjpSampler throws java.lang.StringIndexOutOfBoundsException
Bug 50516 - "Host" header in HTTP Header Manager is not included in generated HTTP request
Bug 50544 - In Apache Common Log the HEAD requests cause problems.
Bug 51268 - HTTPS request through an invalid proxy causes NullPointerException and does not show in result tree.
Rather than delegating to the JMeter thread handler for "unexpected" failures, ensure all Exceptions generate a sample error.
Bug 51275 - Cookie Panel clearGui() sets incorrect default policy in Java 1.6
Other Samplers
Bug 50173 - JDBCSampler discards ResultSet from a PreparedStatement
Ensure JSR223 Sampler has access to the current SampleResult
Bug 50977 - Unable to set TCP Sampler for individual samples
Controllers
Bug 50032 - Last_Sample_Ok along with other controllers doesnt work correctly when the threadgroup has multiple loops
Bug 50080 - Transaction controller incorrectly creates samples including timer duration
Bug 50134 - TransactionController : Reports bad response time when it contains other TransactionControllers
Bug 50367 - Clear / Clear all in View results tree does not clear selected element
Bug 51488 - Assertion: Variable name scope is shared among all assertions (and Bug 51255)
Bug 50568 - Function __FileToString(): Could not read file when encoding option is blank/empty
Bug 50811 - Incomplete Spanish translation
Bug 49734 - Null pointer exception on stop Threads command (Run>Stop)
Bug 49666 - CSV Header read as data after EOF
Bug 45703 - Synchronizing Timer
Bug 50088 - fix getAvgPageBytes in SamplingStatCalculator so it returns what it should
Bug 50203 Cannot set property "jmeter.save.saveservice.default_delimiter=\t"
mirror-server.sh - fix classpath to use : separator (not ;)
Bug 50286 - URL Re-writing Modifier: extracted jsessionid value is incorrect when is between XML tags
System.nanoTime() tends to drift relative to System.currentTimeMillis().
Change SampleResult to recalculate offset each time.
Also enable reversion to using System.currentTimeMillis() only.
Bug 50425 - Remove thread groups from Controller add menu
Bug 50675 - CVS Data Set Config incompatible with Remote Start
Fixed RMI startup to provide location of JMX file relative to user.dir.
Bug 50221 - Renaming elements in the tree does not resize label
Bug 51002 - Stop Thread if CSV file is not available. JMeter now treats IOError as EOF.
Define sun.net.http.allowRestrictedHeaders=true by default. This fixes Bug 51238.
Bug 51645 - CSVDataSet does not read UTF-8 files when file.encoding is UTF-8
Improvements
HTTP Samplers
AJP Sampler now implements Interruptible
Allow HTTP implementation to be selected at run-time
Bug 50684 - Optionally disable Content-Type and Transfer-Encoding in Multipart POST
Bug 50943 - Allowing concurrent downloads of embedded resources in html page
Bug 50170 - Bytes reported by http sampler is after GUnZip
Add optional properties to allow change the method to get response size
Hiding the proxy password on HTTP Sampler (just on GUI, not in JMX file)
Other samplers
Bug 49622 - Allow sending messages without a subject (SMTP Sampler)
Bug 49603 - Allow accepting expired certificates on Mail Reader Sampler
Bug 49775 - Allow sending messages without a body
Bug 49862 - Improve SMTPSampler Request output.
Bug 50268 - Adds static and dynamic destinations to JMS Publisher
JMS Subscriber - Add dynamic destination
Bug 50666 - JMSSubscriber: support for durable subscriptions
Bug 50937 - TCP Sampler does not provide for / honor connect timeout
Bug 50569 - Jdbc Request Sampler to optionally store result set object data
Bug 51011 - Mail Reader: upon authentication failure, tell what you tried
Controllers
Bug 50475 - Introduction of a Test Fragment Test Element for a better Include flow
View Results Tree - Add a dialog's text box on "Sampler result tab > Parsed" to display the long value with a double click on cell
Bug 37156 - Formatted view of Request in Results Tree
Bug 49365 - Allow result set to be written to file in a path relative to the loaded script
Bug 50579 - Error count is long, sample count is int. Changed sample count to long.
View Results Tree - Add new size fields: response headers and response body (in bytes) - derived from Bug 43363
Timers, Assertions, Config, Pre- & Post-Processors
Bug 48015 - Proposal new icons for pre-processor, post-processor and assertion elements
Bug 50962 - SizeAssertionGui validation prevents the use of variables for the size
Size Assertion - Add response size scope (full, headers, body, code, message) - derived from Bug 43363
Bug 49975 - New function returning the name of the current sampler
Add French translation for the new labels and reduce size for some labels (by abbreviation) on HTTP Sample
Bug 30563 - Thread Group should have a start next loop option on Sample Error
Bug 50347 - Eclipse setup instructions should remind user to download dependent jars
Bug 50490 - Setup and Post Thread Group enhancements for better test flow.
All BeansShell test elements now have the script variables "prev" and "Label" defined.
Bug 50708 - Classpath jar order in NewDriver not alphabetically
Bug 50659 - JMeter server does not support concurrent tests - prevent client from starting another
Added remote shutdown functionality
Client JMeter engine now supports external stop/shutdown via UDP
UDP shutdown can now use a range of ports, from jmeterengine.nongui.port=4445 to jmeterengine.nongui.maxport=4455,
allowing multiple JMeter instances on the same host without needing to change the port property.
Updated to httpcore 4.1.3 and httpclient 4.1.2
Non-functional changes
Bug 50008 - Allow BatchSampleSender to be subclassed
Bug 50450 - use System.array copy in jacobi solver as, being native, is more performant.
Bug 50487 - runSerialTest verifies objects that never need persisting
Use Thread.setDefaultUncaughtExceptionHandler() instead of private ThreadGroup
Update to Commons Net 3.0
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