Packaging cygnus-common results in an empty jar

问题

I'm trying to install cygnus-common following this guide but the creation of the cygnus-common jar (incl. dependencies) always results in an empty jar. Apache-Flume installed without any issues. I've tried increasing the memory for the Maven JVM as per the guide but this hasn't helped.

~/fiware-cygnus/cygnus-common$ mvn clean compile exec:exec 
assembly:single
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building cygnus-common 1.1.0
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ cygnus-common ---
[INFO] Deleting /home/cygnus/fiware-cygnus/cygnus-common/target
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ cygnus-common ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 2 resources
[INFO] 
[INFO] --- maven-compiler-plugin:2.3.2:compile (default-compile) @ cygnus-common ---
[INFO] Compiling 50 source files to /home/cygnus/fiware-cygnus/cygnus-common/target/classes
[INFO] 
[INFO] --- exec-maven-plugin:1.5.0:exec (default-cli) @ cygnus-common ---
[INFO] 
[INFO] --- maven-assembly-plugin:2.6:single (default-cli) @ cygnus-common ---
[INFO] Building jar: /home/cygnus/fiware-cygnus/cygnus-common/target/cygnus-common-1.1.0-jar-with-dependencies.jar
Killed

Here's the resultant file

~/fiware-cygnus/cygnus-common$ ls -lrth target/
total 12K
drwxrwxr-x 3 cygnus cygnus 4.0K Jun 13 14:57 generated-sources
drwxrwxr-x 3 cygnus cygnus 4.0K Jun 13 14:57 classes
drwxrwxr-x 2 cygnus cygnus 4.0K Jun 13 14:57 archive-tmp
-rw-rw-r-- 1 cygnus cygnus    0 Jun 13 14:58 cygnus-common-1.1.0-jar-with-dependencies.jar

A similar question was asked before with no resolution documented. The only suggestions given for that question was either lack of disk space, memory or permissions. Disk space is definitely not an issue, I have increased the memory for the Maven JVM and the user has the correct permissions.

EDIT:

So I ran the mvn compile in debug mode as suggested by @frb and it was memory issue

#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (malloc) failed to allocate 257024000 bytes for committing reserved memory.
# Possible reasons:
#   The system is out of physical RAM or swap space
#   In 32 bit mode, the process size limit was hit
# Possible solutions:
#   Reduce memory load on the system
#   Increase physical memory or swap space
#   Check if swap backing store is full
#   Use 64 bit Java on a 64 bit OS
#   Decrease Java heap size (-Xmx/-Xms)
#   Decrease number of Java threads
#   Decrease Java thread stack sizes (-Xss)
#   Set larger code cache with -XX:ReservedCodeCacheSize=
# This output file may be truncated or incomplete.
#
#  Out of Memory Error (os_linux.cpp:2827), pid=48868, tid=140567873734400

  [1]: http://fiware-cygnus.readthedocs.io/en/latest/cygnus-common/installation_and_administration_guide/install_from_sources/index.html#section3 "guide"

using top I was able to see that the memory usage was over 70% when the process got killed. The system has ~1.7Gb which is well above the stated requirements, and it is a 64bit system.

I had the system memory increased to 3Gb and the build succeeded so perhaps the hardware requirements should be updated?

回答1:

Increasing the system memory to 3Gb fixed this issue and the jar was created successfully.

来源：https://stackoverflow.com/questions/37807381/packaging-cygnus-common-results-in-an-empty-jar

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fiware-cygnus