Tag Archives: java
Unit-testing time/timing dependent components
I’m often faced with developing components that are depending on time or timing, one way or the other. An example can be a query that returns all “active” rows, given current date/time and where the rows have effective and expiry … Continue reading
SimpleDateFormat instances are not thread-safe
It comes as a surprise to many developers that SimpleDateFormat instances are not thread-safe. Sometimes I encounter utility classes like below: public class DateUtil { public static final SimpleDateFormat ISO_DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd"); public static final SimpleDateFormat SQL_TIMESTAMP_FORMAT = new … Continue reading
Salesforce JAXB: Using wsimport to generate client artifacts
The Salesforce developer documentation provides JAVA examples based on WSC. WSC is a nice tool that makes interfacing to SFDC simple and easy, providing an EnterpriseConnection hiding all the details in calling SFDC. But, WSC might not be for you: … Continue reading
Salesforce wsc: upsert null fields
The salesforce upsert() call is brilliant for interfacing legacy systems with Salesforce, especially if the data you are going to replicate into already contains some sort of unique identification. It will create records that does not exist, and update … Continue reading
Salesforce wsc: ConnectionException should have been Fault
This is the first article where I discuss details or issues using wsc (JAVA) on an Oracle WebLogic platform to integrate Customer Legacy systems with Salesforce CRM. In some environments (specifically the WLS 10.3.5 used as production environment at my … Continue reading
usl4j – Ultra Simple Logging for JAVA
Back in the late 90’ties when I started programming JAVA there were no standard way of logging in JAVA programs. One usually just used System.out.println(), System.err.println() and Exception.printStacktrace(). Often applications would build homemade logging frameworks that would also log information … Continue reading
Squareroot (sqrt) with BigDecimal
Recently I was refactoring some code from using double to using BigDecimal and suddenly needed a square root method. I remembered years ago I was taught a simple “successive approximation” method; believe it was grammar school. I searched the net … Continue reading
Implementing a simple database semaphore
In this article I will describe a simple technique that enables you to implement an “exclusive lock” in a distributed, even clustered, environment. The technique works with all major databases, and should work with any database that has a reasonable … Continue reading
Financial (monetary) computations using floating point arithmetic [in JAVA]
In this article, I will discuss some of the issues in doing financial calculations in JAVA. The issues are not related to JAVA only, but to any calculation done in a “computer language” using binary floating point arithmetic, including calculations … Continue reading
Trusting any “secure” host
My main concern is developing server-side JAVA-applications: J[2]EE applications. When working with hobby-projects, I’m often faced with situations where I need to call other “third-party” applications over HTTP, in order to obtain some information important to me in specific situations. … Continue reading
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