Welcome!

Java IoT Authors: Jason Bloomberg, Liz McMillan, Elizabeth White, Pat Romanski, Stackify Blog

Related Topics: Java IoT, Industrial IoT, Machine Learning , Apache

Java IoT: Blog Post

Exploit the Results of Pmd, Findbugs and CheckStyle

Go deep inside the reults of the known Java static analysis tools.

Many Java static analysis tools exist right here, each one focusing on a specific area and each one has its advantages, we can enumerate:

  • Pmd which is a static rule-set based Java source code analyzer that identifies potential problems like:
    • Possible bugs—Empty try/catch/finally/switch blocks.
    • Dead code—Unused local variables, parameters and private methods.
    • Empty if/while statements.
    • Overcomplicated expressions—Unnecessary if statements, for loops that could be while loops.
    • Suboptimal code—Wasteful String/StringBuffer usage.
  • FindBugs which looks for bugs in Java code. It uses static analysis to identify hundreds of different potential types of errors in Java programs.
  • Checkstyle defines a set of available modules, each of which provides rules checking with a configurable level of strictness (mandatory, optional...). Each rule can raise notifications, warnings, and errors.

Many ways exist to exploit the results of these tools:

  • XML format: XML files could be generated from each of these tools, and it can be used to create an HTML report or used by another tool to exploit the analysis result.
  • HTML format: HTML report is the prefered way to generate reports and share them between the team, and you can create your custom report by using an xsl stylesheet.
  • IDE Plugins: almost all known IDE provides plugins for these tools, which gives the possibility to discover all violations from the source code.

One of the problems with code quality tools is that they tend to overwhelm developers with problems that aren't really problems -- that is, false positives. When false positives occur, developers learn to ignore the output of the tool or abandon it altogether.

And to exploit better their result, it's better to have a way to focus only on what we want and gives to developers a useful view. In this post we will discover another interesting way to exploit better the result of all known java static analysis tools, and query them like a database.

JArchitect and CQLinq
JArchitect
is another static analysis tool which complements the other tools, it uses a code query langage based on Linq ( CQLinq) to query the code base like a database.

Until JArchitect 3 you can query only analysis data extracted from JArchitect, however the V4 gives the possibility to import the analysis result from many other static analysis tools and query them with CQLinq.
Let's take as example the source code of the PDT core (the Php plugin for eclipse). and discover how we can exploit the analysis result of these tools from JArchitect.

To begin here are the steps to follows before requesting the analysis result:

  • Step1: Analyse the project with PMD, CPD, FindBugs and CheckStyle. And generate the XML files containing the result.
  • Step2: Analyze the project with JArchitect.
  • Step3: Import all the xml files into JArchitect from the menu "Plugins->Import Plugins Result Files"

JArchitect provides by default many useful queries to request these tools, and all these queries could be customized easilly.

plugins2

Let's discover some CQLinq queries:

Get all issues:

The request to get all issues is very simple, however as you can see it's not very interesting, indeed it's a challenge to exploit a result with 232 725 issues.

plugins1

To exploit better the result of these tools we can filter it with CQLinq and focus only on what we want.

Request by tool
We can modify the first request and add a criteria about the tool concerned.
plugins3

Request by ruleset

We can also filter by issue ruleset :

plugins20

Request by priority
We can also filter by priority:

plugins8

Most recurrent issues

It's interesting to know which issues are the most reported by these tools.

plugins10

Classes having most issues

It's very interesting to know the classes which contains many violations

plugins16

As we can observe CheckStyle report thousand of issues and many of them could be ignored.

The previous query is interesting, but it's not give us exactly the classes with lack of quality, another useful metric to take into account is the NBLinesOfCode, it's normal that a class with many lines of code contains many issues, for that we can modify the previous request to calculate the ratio between the Issues count and the NBLinesofCode.

plugins17

What's very strange in this result is that the ratio of the 8 first classes is more than 200, in this case we have more than 200 issues by code line.

To explain this behavior let's take a look at some lines of the CompilerAstParser:

plugins18

The NbLinesOfCode is the number of statements and not the physical lines, and this Class declare many arrays , each one is declared by thousand of physical lines, however each array declaration is considered as one statement.

And as shown before for the most recurrent issues query, the following rule '+' should be on a new line. is violated thousand of times for each array. Maybe it's better to remove these kind of rules from the CheckStyle configuration file.

Most popular methods having issues

When the static analysis tools report the issues, it's useful to locate which the prioritary issues to resolve? specially if it concerns bugs.

It's true that a bug could exist in a specific method, but what interesting to know is how many methods are impacted by the bug, and the popular method are the most used ones and it's better to resolve them quickly.

plugins11

Using CQLinq we can combine the result of all these tools and also the result of JArchitect to create more elaborated queries, and add these checks to the build process.

Issues Trend

Having issues in a project is not bad, we can say that's normal, however we have to check the quality trend of the project. Indeed it's a bad indicator if the number of issues grows after changes and evolutions. /p>

JArchitect provides the Trend Monitoring feature to create trend charts. Trend charts are made of trend metrics values logged over time at analysis time. More than 50 trend metrics are available per default and it is easy to create your own trend metrics.

Let's create a trend metric for the Pmd issues:

plugins6

And after you can easily create the trend chart to monitor the previous trend metric and add it to the JArchitect dashboard.

plugins19

With this trend chart we can monitor the evolution of the Pmd issues, and try to understand the reasons when the metric grows over versions.

Customize the JArchitect report

JArchitect make possible to append extra report sections in the HTML report that lists some CQLinq queries. In the CQLinq Query Explorer panel, a particular CQLinq group reported is bordered with an orange rectangle.

plugins12

You can also add to the report the Pmd trend chart:

plugins15

And in the HTML report these added sections are accesible from the menu:

plugins13

And here's the page added in the report for the Pmd CQLinq queries:

plugins14

Conclusion
JArchitect 4 is now open to other static analysis tools, and you can also plug your customized tool easily as descibed here. This way you can use all the JArchitect features to exploit better the result from the known java static analysis tools.

More Stories By Lahlali Issam

Lahlali Issam Lead Developer at JavaDepend, a tool to manage and understand complex Java code. With JavaDepend, software quality can be measured using Code Metrics, visualized using Graphs and Treemaps, and queried using CQL language, a SQL like to query the code base.

@ThingsExpo Stories
SYS-CON Events announced today that DXWorldExpo has been named “Global Sponsor” of SYS-CON's 21st International Cloud Expo, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Digital Transformation is the key issue driving the global enterprise IT business. Digital Transformation is most prominent among Global 2000 enterprises and government institutions.
Elon Musk is among the notable industry figures who worries about the power of AI to destroy rather than help society. Mark Zuckerberg, on the other hand, embraces all that is going on. AI is most powerful when deployed across the vast networks being built for Internets of Things in the manufacturing, transportation and logistics, retail, healthcare, government and other sectors. Is AI transforming IoT for the good or the bad? Do we need to worry about its potential destructive power? Or will we...
SYS-CON Events announced today that Daiya Industry will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Daiya Industry specializes in orthotic support systems and assistive devices with pneumatic artificial muscles in order to contribute to an extended healthy life expectancy. For more information, please visit https://www.daiyak...
SYS-CON Events announced today that SIGMA Corporation will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. uLaser flow inspection device from the Japanese top share to Global Standard! Then, make the best use of data to flip to next page. For more information, visit http://www.sigma-k.co.jp/en/.
SYS-CON Events announced today that B2Cloud will exhibit at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. B2Cloud specializes in IoT devices for preventive and predictive maintenance in any kind of equipment retrieving data like Energy consumption, working time, temperature, humidity, pressure, etc.
SYS-CON Events announced today that NetApp has been named “Bronze Sponsor” of SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. NetApp is the data authority for hybrid cloud. NetApp provides a full range of hybrid cloud data services that simplify management of applications and data across cloud and on-premises environments to accelerate digital transformation. Together with their partners, NetApp em...
SYS-CON Events announced today that Interface Corporation will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Interface Corporation is a company developing, manufacturing and marketing high quality and wide variety of industrial computers and interface modules such as PCIs and PCI express. For more information, visit http://www.i...
SYS-CON Events announced today that Massive Networks, that helps your business operate seamlessly with fast, reliable, and secure internet and network solutions, has been named "Exhibitor" of SYS-CON's 21st International Cloud Expo ®, which will take place on Oct 31 - Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. As a premier telecommunications provider, Massive Networks is headquartered out of Louisville, Colorado. With years of experience under their belt, their team of...
SYS-CON Events announced today that Mobile Create USA will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Mobile Create USA Inc. is an MVNO-based business model that uses portable communication devices and cellular-based infrastructure in the development, sales, operation and mobile communications systems incorporating GPS capabi...
SYS-CON Events announced today that Nihon Micron will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Nihon Micron Co., Ltd. strives for technological innovation to establish high-density, high-precision processing technology for providing printed circuit board and metal mount RFID tags used for communication devices. For more inf...
SYS-CON Events announced today that N3N will exhibit at SYS-CON's @ThingsExpo, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. N3N’s solutions increase the effectiveness of operations and control centers, increase the value of IoT investments, and facilitate real-time operational decision making. N3N enables operations teams with a four dimensional digital “big board” that consolidates real-time live video feeds alongside IoT sensor data a...
SYS-CON Events announced today that Suzuki Inc. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Suzuki Inc. is a semiconductor-related business, including sales of consuming parts, parts repair, and maintenance for semiconductor manufacturing machines, etc. It is also a health care business providing experimental research for...
While some developers care passionately about how data centers and clouds are architected, for most, it is only the end result that matters. To the majority of companies, technology exists to solve a business problem, and only delivers value when it is solving that problem. 2017 brings the mainstream adoption of containers for production workloads. In his session at 21st Cloud Expo, Ben McCormack, VP of Operations at Evernote, will discuss how data centers of the future will be managed, how th...
SYS-CON Events announced today that Ryobi Systems will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Ryobi Systems Co., Ltd., as an information service company, specialized in business support for local governments and medical industry. We are challenging to achive the precision farming with AI. For more information, visit http:...
SYS-CON Events announced today that MIRAI Inc. will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. MIRAI Inc. are IT consultants from the public sector whose mission is to solve social issues by technology and innovation and to create a meaningful future for people.
SYS-CON Events announced today that mruby Forum will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. mruby is the lightweight implementation of the Ruby language. We introduce mruby and the mruby IoT framework that enhances development productivity. For more information, visit http://forum.mruby.org/.
SYS-CON Events announced today that Fusic will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Fusic Co. provides mocks as virtual IoT devices. You can customize mocks, and get any amount of data at any time in your test. For more information, visit https://fusic.co.jp/english/.
In his session at @ThingsExpo, Greg Gorman is the Director, IoT Developer Ecosystem, Watson IoT, will provide a short tutorial on Node-RED, a Node.js-based programming tool for wiring together hardware devices, APIs and online services in new and interesting ways. It provides a browser-based editor that makes it easy to wire together flows using a wide range of nodes in the palette that can be deployed to its runtime in a single-click. There is a large library of contributed nodes that help so...
SYS-CON Events announced today that Enroute Lab will exhibit at the Japan External Trade Organization (JETRO) Pavilion at SYS-CON's 21st International Cloud Expo®, which will take place on Oct 31 – Nov 2, 2017, at the Santa Clara Convention Center in Santa Clara, CA. Enroute Lab is an industrial design, research and development company of unmanned robotic vehicle system. For more information, please visit http://elab.co.jp/.
Agile has finally jumped the technology shark, expanding outside the software world. Enterprises are now increasingly adopting Agile practices across their organizations in order to successfully navigate the disruptive waters that threaten to drown them. In our quest for establishing change as a core competency in our organizations, this business-centric notion of Agile is an essential component of Agile Digital Transformation. In the years since the publication of the Agile Manifesto, the conn...