Wednesday, October 11, 2017

Show MBeans tab in Java VisualVM

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To show the "MBeans" tab in Java VisualVM, check your Java version first as follows: $ java -version java version "1.8.0_1...
Monday, September 11, 2017

org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [org.springframework.boot.actuate.endpoint.ConfigurationPropertiesReportEndpointMethodAnnotationsTests$Foo]

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When you build Spring Boot, you might encounter the following error: java.lang.IllegalStateException: Unstarted application context org.sp...
Wednesday, August 23, 2017

Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.0.0.BUILD-SNAPSHOT:start (pre-integration-test) on project start-stop-automatic-fork: Could not figure out if the application has started: Failed to connect to MBean server at port 50975: Spring application did not start before the configured timeout (30000ms -> [Help 1]

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When building Spring Boot with "./mvnw clean install", you might encounter the following error: [INFO] Exception in thread ...
Wednesday, June 14, 2017

Increase max heap size for Gradle test

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To increase max heap size for Gradle test, add the following to your "build.gradle": test {     maxHeapSize = "4g" }...
Monday, June 12, 2017

How to change "launchctl limit maxfiles"

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You can change it as follows: $ launchctl limit maxfiles maxfiles    256            unlimited     $ sysctl kern.maxfiles kern.maxfiles...
Sunday, May 21, 2017

Using MySQL in R

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You can use MySQL in R as follows: > install.packages("RMySQL") ... > library(RMySQL) Loading required package: DBI ...

Library not loaded: /opt/X11/lib/libSM.6.dylib

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When you install RMySQL, you might encounter the following error: > install.packages("RMySQL") ...   unable to load shared ...