ColdFusion performance issues and troubleshooting

Performance issues are one of the biggest challenges to expect when designing and implementing web applications. Performance problems can disrupt your business, which can result in short and long term loss of revenue.

The ColdFusion support team at Adobe, has dealt with several performance related issues with ColdFusion and a couple of them, around JDK 1.8 as well.

Based on our experience with customers, the major performance issues could be categorized as – CPU hikes, Website crashes, Processing of slow requests, Memory (for example, OutOFMemory, Memory leaks) issues, Error 503/Service unavailable error, Slow performance while running database queries, SecureRandom seed generation on some linux servers, Network latency and likewise.

ColdFusion is a Java-based application server. Any Java-related change directly impacts ColdFusion. With introduction of Java 1.8, ColdFusion had to be optimized for Java 1.8. Even after the optimization, there could be few parameters, that might cause the performance hit on the ColdFusion server.

Let’s discuss about these performance issues, method to trace them, and their possible resolutions, in a bit more detail.

CPU Hike: Hikes in CPU usage are the most common performance issue, which we experienced. Usually, the absence of load and performance testing fails to predict the impact on existing CPU utilization. CPU hike can occur due to various reasons, such as: –

● Out of memory issues
● Excessive Garbage collection
● Slow database query processing
● Network latency
● Linux random number generation
● Security scanner

This is the first parameter we must look at, when CPU surges/spikes are seen in your ColdFusion application. We can check the ColdFusion logs for OutOfMemory entries. There are two possible scenarios further.

● OutOfMemoryError: Heap – Generally OutOfMemory:Heap would not only happen because application usage is higher than the upper limit provided. But, it can also happen, because a lower value of heap, than actual usage could slow down the jvm. OutOfMemory could be because GC is not able to claim memory. This could happen because of strong references to stale objects or aggressive load so that before GC cleans up OOM is thrown. The default value for Maximum JVM Heap Size is 1GB in ColdFusion (2016 release). Based on your application’s memory usage, we can update the maximum heap value.You can change the value in ColdFusion Administrator or in jvm.config (ColdFusionXXXX/instance_name/bin).

● OutOfMemoryError: Metaspace: A new flag is available in Java 1.8 (MaxMetaspaceSize), allowing you to limit the amount of native memory used for class metadata.
In metaspace, most allocations for the class metadata are now allocated out of native memory. By default class metadata allocation is limited by the amount of available native memory. Garbage collection of the dead classes and classloaders is triggered once the class metadata usage reaches the “MaxMetaspaceSize”. Proper monitoring & tuning of the Metaspace will obviously be required in order to limit the frequency or delay of such garbage collections. Excessive Metaspace garbage collections may be a symptom of classes, classloaders memory leak or inadequate sizing for your application. If you don’t specify this flag, the Metaspace will dynamically resize depending of the application demand at runtime.

Excessive Garbage collection:
Extra load on a server triggers increased GC and causes CPU spikes. There are four types of Garbage collectors. We must figure out the one, that best suits your application.

For more information on Garbage collections please refer to below documentation:

By default, ColdFusion uses parallel GC. You can change the values in jvm.config (ColdFusionXXXX/instance_name/bin):

-XX:+UseG1GC – This is recommended when heap size is large (At least more than 4GB)

For detailed investigation of memory leaks or out of memory errors, a heap dump analysis can be very useful. Add the following jvm arguments in jvm.config(ColdFusionXXXX/instance_name/bin) to obtain heap dump:
-XX:HeapDumpPath= <path_to_dump_file>

If you have JDK installed, run the following command from \jdk\bin directory:
jmap -dump:format=b,file=dump.hprof  where pid is the ColdFusion process id.
You can use Eclipse Memory Analyzer Tool (MAT) to review heap dumps.

Slow Database query processing:
ColdFusion logs (Application, Exception, error log) sometimes indicate whether your queries timeout or not. You can then identify slow queries and fix them.

CF does closes the connections after the timeout. CF reuses the idle/unclosed connections. When required unless the connection is still busy executing some query. If the query execution is taking too long, it has to be a problem with either the application or the database. The idle connections are being re-used, as and when required.

Technical details about the timeout:
We take two parameters in admin for this – Timeout and interval.
CF closes a maximum of 5 timed out connections at each interval. Say for example, If we have 20 open connections with timeout being set to 10 and interval being set to 5, then CF will close:-
0 connections after 5 mins
5 connections after 5 more mins
5 more connections after 5 more mins
5 more connections after 5 more mins
5 more connections after 5 more mins

So to close all the connections (as per above calculation), CF will take at least 25 mins to close, all open connections. The maximum limit of closing 5 timeout connections is not configurable and is by design.

The optimized value for timeout can be set 5 and interval to 1. You can configure them further, as per your application requirement. You can change the database timeout value in CF administrator in Advanced settings of Data & Services > Datasources to optimize idle/unclosed connections.

Network latency
If the application code resides and being accessed from a shared drive in ColdFusion Application, network latency can cause slow request processing, resulting in performance issues. This can even cause a server to crash/unresponsive. Its highly recommended to check your internal Network throughput. You can also refer to the information available on below blog:

You may try below :
Add the jvm arguments below to speed up the the processing of cfm pages on network/shared location:

Note that 30 sec is default timeout.

This enables canonical cache that caches the canonical path of a file. This helps, when there are a lot of threads waiting to get path from WinNTFileSystem. While accessing files from a network drive, each “getCanonicalPath” would end up going to network and would become quite expensive task. Enabling this cache means that for same file, JVM would never go back to disk (till the time it is in cache) to find its path.

Linux random number generation:
Random number generation and server startup is slow on Unix platforms for some of the servers. This could be because, /dev/random is used in Unix platforms for random number generation. is designed to be crypto secure. It provides strong and secure random numbers. SecureRandom should be used when high-quality randomness is important and is worth consuming CPU. We can add the below jvm argument, to get rid of performance issue due to random number generation:

Security scanner:
If you see CPU spikes at some specific time of the day/week, this could be due to a third party security scanner interfering with your ColdFusion application. The scanner hits the server monitoring port 5500 (by default) with, which goes to infinite loop and causes server crash.

To fix this issue, we need to modify the jetty.xml at ColdFusionXXXX\cfusion\lib. Change the Server monitoring IP address from to and restart ColdFusion.

Code Cache:
If your program has high codecache memory set via -XX:ReservedCodeCacheSize, you can limit it by disabling code cache flushing. If flushing is disabled, the JIT does not compile methods after the codecache fills up and hence there won’t be CPU hikes. You can add the following jvm argument. This can be used to flush code cache.

You can also disable tieredcompilation with below argument:
-XX:-TieredCompilation (Applicable only with Java 1.8. Java versions less than 8 doesn’t have tiered compilation enabled by default.)

Service unavailable error:
503 – Service unavailable is a generic error. Whenever we get this error, the first thing we should check is, whether ColdFusion is started and running or not. In case you experience intermittent 503’s, then its time to investigate the less responsive server, which might be dropping requests. This could be because of Long GC pauses or any reason that could delay response from ColdFusion server. The ColdFusion connector tuning can help us to overcome service unavailable error. Below blog post can be used to tune ColdFusion connector and avoid such errors.

We have also seen some issues because of bugs in few specific update level of java. The best practice would be to keep your ColdFusion Java updated to latest version. Use the below blog to keep your java up to date.

ColdFusion thread dumps:
ColdFusion thread dumps can be used to analyze New, Runnable, Blocked, Waiting, Timed_Waiting and Running threads.
The issues such as Thread race, Deadlock, Hang IO calls, GC/OutOfMemory exceptions, Infinite Loop can be determined using the thread dumps. Following Blog can be used to take thread dump on a ColdFusion server:
If you are on CF11 update 12 and CF2016, you can skip copying threaddump.jar. And just use takethreaddump.cfm file to capture the thread dump.

Another issue we have seen in one or two cases, If the performance is impacted by XML parsing, the jvm argument below can fix it:

The other causes of performance issue include:
Lack of proper database SQL tuning & capacity planning
Application specific performance problems
Lack of proper data caching
Excessive data caching
Excessive logging

In case the above steps does not resolve the issue, please feel free to contact Adobe support ( for analysis of the issue.

Some key points to remember:-

*Please note that, any changes made to jvm.config, would require a ColdFusion service restart.

Jvm.config: ColdFusionXXXX/instance_name/bin
ColdFusion logs: ColdFusionXXXX/instance_name/logs


Adobe ColdFusion Summit – East in Washington, D.C on April 25

We are excited to announce the third annual Adobe ColdFusion Summit East in Washington, D.C on April 25th.

The conference is on April 25th and we are having two tracks. We have sessions from experts in the community which would cover most of the major features of ColdFusion.

The conference is FREE to attend, just register at the link provided below.

Register Here:

Event Time : 8:30 AM – 4:00 PM

Location: Renaissance Washington, DC Downtown Hotel
999 Ninth Street NW
Washington, DC 20001

The event is complimentary, and breakfast and lunch will be provided.

Detailed Agenda would follow soon.

ColdFusion Roadshow Interest

In 2018, ColdFusion Team will present a series of Breakfast roadshow events in US, India and Europe.

The purpose of these events will be to talk about the new features in the upcoming release as well as the exciting features added in the previous releases.

These events also provide a platform for professional exchange within and across the ColdFusion community in your area. The programme will be made up of interactive sessions giving the information and tools necessary for making your work easy.

At this stage we are attempting to gauge interest in such an event in your area. Please respond to the survey here so that we may ascertain your interest. If you need any more information please drop a mail to me at

Adobe ColdFusion at Lenox

People are cooking and eating at home more often for their health and for the fun of it, which is good news for Lenox Corporation. The luxury tableware and gift maker is taking advantage of the shift in preferences by upgrading its technologies to target younger audiences who do much of their shopping online.


Implementing Adobe ColdFusion Enterprise lets Lenox update apps it has built over the past 19 years and create new apps that enhance e-commerce capabilities. For instance, the company is converting external ColdFusion applications, such as its B2B and supply chain websites, and internal applications including business intelligence tools and its employee intranet.


As my developers convert applications, they find new features in Adobe ColdFusion that accelerate and simplify processes,” says Betty Jeitner, Senior Director IT Applications, Lenox Corporation. “At this point, we have yet to discover everything we can do.”


Currently, three developers support ColdFusion rapid application development, long-term usage, and system stability. Once they migrate ColdFusion to new hardware, the team will also integrate it with mission-critical software, including Lenox’s Enterprise Resource Planning (ERP) system.

Scalable and Affordable Performance Coaching

Leadership coaching and development can benefit leaders at any level, helping employees contribute more effectively to an organization and improve the work environment as a whole. However, coaching has traditionally been a costly endeavor only open to employees at the highest level.

Skyline Group International approaches leadership differently. Using technology, Skyline provides high-quality, personalized coaching that is both scalable and affordable. Skyline’s Coaching for Excellence (C4X) platform provides flexible one-to-one coaching anytime, anywhere through online access.

Each C4X program is a 16-week process that combines online meetings with coaches and independent study using C4X online resources, which include videos, white papers, and articles. HR managers can monitor progress via C4X’s real-time dashboard. Mobile capabilities allow clients, leaders, coaches, and HR managers to access C4X functionality from any device.

When Skyline was developing its first iteration of C4X, it evaluated multiple development platforms. It selected Adobe ColdFusion for its rapid programming capabilities, enterprise security, and “battle-tested” technology.

From a single set of schematics, the first C4X application was deployed within 12 weeks using Adobe ColdFusion,” says Milo Sindell, President of C4X Product Development at Skyline Group, Inc. “It’s now grown to four products with dozens features, multiple administration areas, reporting capabilities, and a user interface that continually evolves with client needs.”

Developers enhanced ColdFusion capabilities by integrating with external services, such as SendGrid for email and Java-based libraries, and supporting systems such as Sublime Text and CodeKit. The built-in PDF rendering engine and custom fonts in ColdFusion allow HR managers to generate visually appealing reports.

“Skyline is continually evolving C4X to meet the needs of our customers,” says Stacy Shamberger, Executive Vice President of People and Revenue at Skyline Group, Inc. “We see Adobe ColdFusion supporting that growth for years to come.”

ColdFusion Summit 2017 Early bird price extended till September 15th!

We have had a lot of requests for extension of the early bird pricing for CF Summit to get them some more time for registration. So we’ve extended the $349 early bird rate until Friday, September 15th to give everyone a chance to register under the discount rate.

This year we have more than 40 sessions across 4 tracks with talks from our community leaders and CF Engineering team. The pre-conference sessions on November 15th would have three topics to choose from.

For further details please visit the website at

Adobe ColdFusion Developer Week :: July 31st – Aug 4th

We are pleased to bring you ColdFusion Developer Week once again this year from 31st July – 4th August with some great topics. ColdFusion Developer week is a full week of completely FREE webinars (2-a-day) put on by the Adobe team. Register Now at

We got some great topics from what is planned for the future versions, REST, API manager, Language changes and much more. All the sessions would be held remotely and the recordings would be available later in case you couldn’t make it at the scheduled time. Please try to attend the live sessions as it would be more engaging and you would be able to talk directly to the developers who worked on the features.

The session timings would be 9:00 AM and 12:00 PM Pacific Time, Monday through Friday

Schedule and Topics:

Monday, July 31, 2017 9:00 – 10:00 am The now and the next of Adobe ColdFusion
12:00 – 1:00 pm API Economy: Realizing The Business Value of APIs Through Adobe API Management
Tuesday, August 1, 2017 9:00 – 10:00 am Design of Rest API and Rest in ColdFusion
12:00 – 1:00 pm Upgrade to ColdFusion 2016
Wednesday, August 2, 2017 9:00 – 10:00 am Finding security vulnerabilities in your code base using security analyzer
12:00 – 1:00 pm Load Balancing, Scalability and Failover with ColdFusion Clustering
Thursday, August 3, 2017 9:00 – 10:00 am PDF enhancements in ColdFusion 2016
12:00 – 1:00 pm Language enhancements in ColdFusion 2016
Friday, August 4, 2017 9:00 – 10:00 am Scale with ColdFusion 2016


Register Now!

ColdFusion 2016 API Manager Update 1 released

Update 1 for ColdFusion 2016 API Manager was released on 9th June 2017.

It introduces new features such as a JavaScript connector for configuring User Store, a new Token-based authentication support and packages enhancements like additional Swagger import options and logging for API request and response.

It also fixes several bugs in security, publisher portal and server core and workflows related to SOAP proxy, Swagger and SOAP to REST. For further details on the new features, the installation instructions and the manual download link refer this technote. For the list of bugs fixed with this update refer this webpage.

To be able to apply this update, ensure that you are using an API Manager installation from the latest API Manager installer. The installer was refreshed on Dec 13, 2016. An API Manager installation that has been installed with the new installer would be on build no. 301768.

Post update installation, the build for the API Manager should change to ColdFusion API Manager 2016,0,1,302960. You can validate this by using the apimanagerinfo (.sh/.bat) utility in <CFAPIM_root>/bin directory.

Update 4 for ColdFusion Builder 2016 released

ColdFusion Builder 2016 Update 4 is now available for download.

The update adds support for ColdFusion Builder plugin installation on Eclipse Neon and fixes 22 other bugs.  
The bugs fixed are in areas such as Editor (Dictionary, Code Colorization, Code Folding), Security Code Analyzer and  RDS support. 

For instructions on how to download and install the update, refer this technote.
For the list of bugs fixed with this update, refer this technote.

To access the update directly from the ColdFusion Builder GUI, ensure that it it configured with one of the following URLs depending on the CF Builder variant in use :

Stand-alone installation of ColdFusion BuilderClick here!

Plug-in installation of ColdFusion Builder: Click here!

If you need to download the update and apply it manually, you can access the update at:
Stand-alone Update:
Click here! 
Plugin Update:
Click here!