Home » Author Archives: Dustin Marx (page 6)

Author Archives: Dustin Marx

Does PostgreSQL Have an ORA-01795-like Limit?

The Oracle database requires that no more than 1000 entries be used in a SQL IN portion of a WHERE clause and will throw an ORA-01795 error if that number is exceeded. If a value needs to be compared to more than 1000 values, approaches other than use of IN must be applied. I wondered if this limitation applies to ...

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What Might a New @Deprecated Look Like?

JDK Enhancement Proposal (JEP) 277 (“Enhanced Deprecation“) proposes to “revamp the deprecation annotation and provide tools to strengthen the tail end of the feature life cycle.” Some of the limitations of the current @java.lang.Deprecated have bothered me for some time. I particularly would like to be able to provide text with @Deprecated rather than being forced to place explanatory text ...

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Applying IDE Inspections to Custom Java Annotations

The introduction of annotations with J2SE 5 has changed how we write and process Java. Besides Java SE’s predefined annotations, frameworks, IDEs, and toolkits have introduced their own custom annotations. The Checker Framework has provided examples of how custom annotations can be used to add greater type safety in Java. In this post, I look at the writing of a ...

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Better Performing Non-Logging Logger Calls in Log4j2

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Using logging guards is a common practice when using Log4j 1.x and wanting to avoid the additional performance impact that can occur on some occasions even if the message is not actually logged. One of the most attractive features that Simple Logging Facade for Java (SLF4J) brought to Java logging was the ability to reduce the number of circumstances in ...

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Easy and Consistent Log4j2 Logger Naming

In the post Portable Logger Names with Java 7 Method Handles, I wrote about using Java 7‘s method handles to name classes’ loggers. I stated in that post that advantages of that approach included consistency in logger naming and avoiding accidental copying and pasting of code that might lead to a different class’s name being used for the logger name. ...

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Single Quotes in Oracle Database Index Column Specification

In my previous post, I mentioned that a downside of using double quotes to explicitly specify case in Oracle identifiers is the potential for being confused with the use of single quotes for string literals. Although I don’t personally think this is sufficient reason to avoid use of double quotes for identifiers in Oracle, it is worth being aware of ...

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Downsides of Mixed Identifiers When Porting Between Oracle and PostgreSQL Databases

Both the Oracle database and the PostgreSQL database use the presence or absence of double quotes to indicate case sensitive or case insensitive identifiers. Each of these databases allows identifiers to be named without quotes (generally case insensitive) or with double quotes (case sensitive). This blog post discusses some of the potential negative consequences of mixing quoted (or delimited) identifiers ...

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JDK 9: Highlights from The State of the Module System

Mark Reinhold‘s The State of the Module System (SOMS) was published earlier this month and provides an information-packed readable “informal overview of enhancements to the Java SE Platform prototyped in Project Jigsaw and proposed as the starting point for JSR 376.” In this post, I summarize and highlight some of concepts and terms I found interesting while reading the document. ...

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JAR Manifest Class-Path is Not for Java Application Launcher Only

I’ve known almost since I started learning about Java that the Class-Path header field in a Manifest file specifies the relative runtime classpath for executable JARs (JARs with application starting point specified by another manifest called Main-Class). A colleague recently ran into an issue that surprised me because it proved that a JAR file’s Manifest’s Class-Path entry also influences the ...

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Passing Arrays to a PostgreSQL PL/pgSQL Function

It can be handy to pass a collection of strings to a PL/pgSQL stored function via a PostgreSQL array. This is generally a very easy thing to accomplish, but this post demonstrates a couple of nuances to be aware of when passing an array to a PL/pgSQL function from JDBC or psql. The next code listing is for a contrived ...

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