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Jens A. Lohmann jenslohmann

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  • Copenhagen, Denmark
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@jenslohmann
jenslohmann / toString Generator
Last active June 20, 2022 08:53
Java toString() generator for IntelliJ IDEA that generates JSON
public java.lang.String toString() {
#if ( $members.size() > 0 )
#set ( $i = 0 )
return "{\"_class\":\"$classname\", " +
#foreach( $member in $members )
#set ( $i = $i + 1 )
#if ( $i == $members.size() )
#set ( $postfix = "+" )
#else
#set ( $postfix = "+ "", "" + " )
@jenslohmann
jenslohmann / gist:2bcb472b07e5d6cc4d2df51d4d511bd7
Created February 27, 2020 10:50
Notes on installing GraalVM on MacOS for native-image generation
Download Community Ed. GraalVM from https://github.com/graalvm/graalvm-ce-builds/releases
Unpack.
# sudo mv graalvm-ce-19.0.0 /Library/Java/JavaVirtualMachines
sudo mv graalvm-ce-java11-20.0.0 /Library/Java/JavaVirtualMachines
Verify: /usr/libexec/java_home -V
vi ~/.zprofile
--- Add: ---
export JAVA_HOME=$(/usr/libexec/java_home -v 11)
@jenslohmann
jenslohmann / gist:e31bf324a60d1a3961bd7cbcfaf8547e
Created August 22, 2019 12:43
Poor man's web server for MacOS
while true; do printf 'HTTP/1.1 200 OK\n\n' | nc -4 -k -l 23456; done
@jenslohmann
jenslohmann / PoorMansInjector.java
Created July 4, 2019 19:13
Helper class for injecting objects when not in a Dependency Injection context - typically when unit testing.
package dk.jlo.util;
import java.lang.reflect.Field;
/**
* Injects an object into a (private) field in a bean; primarily for poor man's injection for unit testing when not running in a Dependency Injection environment.<p>
* Travels through super classes if necessary.<p>
* Usage:
* <pre>
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jenslohmann / setTabTitle
Created June 26, 2019 08:29
#!/bin/sh
echo "\033]0;${1}\007\c"
@jenslohmann
jenslohmann / gist:2328aa57dda9460ab9522d03413257ac
Created November 23, 2018 13:52
XPath to check for xsi:nil - it's dead simple
/@xsi:nil = 'true'
@jenslohmann
jenslohmann / javameminfo
Last active November 6, 2018 14:04
Poor man's meminfo for the single JBoss process on the server
#!/bin/bash
if [ $(ps -ef|grep -E "java.*jboss"|grep -v grep|wc -l) -ne 1 ] ; then
echo "Too many (or no) java processes!"
else
jmap -heap $(ps -ef|grep -E "java.*jboss"|grep -v grep|tr -s " "|cut -d\ -f2)
fi
@jenslohmann
jenslohmann / certifcateGeneration
Last active June 19, 2018 09:53
Certificate generation on MacOSX
This might be helpful when generating signed (not strictly self-signed) certificates for use in development on MacOSX.
Testing (against server using the generated server cert):
curl --trace - -3 --insecure --cert clientcert.p12:changeit --get https://localhost:443/
Troubleshooting:
- Check the keychain (Cmd-Space "Keychain Access") for old entries. Delete them :-)
- "-3" avoids some MacOSX curl quirkiness.
- "--insecure" seems to be necessary for MacOSX curl. If you find a way to use "--cacert cacert.pem" instead then tell me :-)
@jenslohmann
jenslohmann / passswordgen
Created December 5, 2017 09:27
Poor man's password generator
#!/bin/bash
while pwd=$(openssl rand -base64 9); [[ ${pwd} == *[[:punct:]]* ]]; do :; done; echo ${pwd}
@jenslohmann
jenslohmann / Add datasource that will reconnect after network failure
Created November 2, 2016 07:48
How to create a datasource using the wildfly CLI that will also reconnect after a network failure
data-source add --jndi-name=java:/<blah>DS --name=<blah>Pool --connection-url=jdbc:oracle:thin:@//<db-hostname>:1521/<SID/db.service> --driver-name=oracle --driver-class=oracle.jdbc.driver.OracleDriver --user-name=<db-user> --password=<db-user-password> --check-valid-connection-sql=select\ 1\ from\ dual --validate-on-match=false --background-validation=true --background-validation-millis=20000