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rails server or console wont start #3753

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swapab opened this issue Mar 22, 2016 · 6 comments
Closed

rails server or console wont start #3753

swapab opened this issue Mar 22, 2016 · 6 comments
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Invalid or Duplicate

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@swapab
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swapab commented Mar 22, 2016

Environment

  • JRuby version :
    jruby 9.0.0.0 (2.2.2) 2015-07-21 e10ec96 Java HotSpot(TM) 64-Bit Server VM 25.65-b01 on 1.8.0_65-b17 +jit [linux-amd64]

  • Java version
    ➜ trunk java -version
    java version "1.8.0_65"
    Java(TM) SE Runtime Environment (build 1.8.0_65-b17)
    Java HotSpot(TM) 64-Bit Server VM (build 25.65-b01, mixed mode)

  • Operating system and platform

    ➜ trunk uname -a
    Linux swapnil-Lenovo-Z50-70 4.2.0-27-generic fix [JRUBY-5765]: cext build fails if 10.4 sdk installed #32-Ubuntu SMP Fri Jan 22 04:49:08 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

    ➜ trunk lsb_release -a
    No LSB modules are available.
    Distributor ID: Ubuntu
    Description: Ubuntu 15.10
    Release: 15.10
    Codename: wily

Relevant info:

Expected Behavior

rails c should start a rails console

Actual Behavior

Exception : LoadError: load error: hpricot_scan -- java.lang.NoSuchMethodError: org.jruby.RubyClass.defineMethod(Ljava/lang/String;Lorg/jruby/runtime/callback/Callback;)V

➜  trunk rails c
/home/swapnil/.rvm/gems/jruby-9.0.0.0@JayApp/gems/prawn-core-0.8.4/lib/prawn/core.rb:34: warning: already initialized constant VERSION
LoadError: load error: hpricot_scan -- java.lang.NoSuchMethodError: org.jruby.RubyClass.defineMethod(Ljava/lang/String;Lorg/jruby/runtime/callback/Callback;)V
           require at org/jruby/RubyKernel.java:940
  block in require at /home/swapnil/.rvm/gems/jruby-9.0.0.0@JayApp/gems/activesupport-3.2.22.1/lib/active_support/dependencies.rb:251
   load_dependency at /home/swapnil/.rvm/gems/jruby-9.0.0.0@JayApp/gems/activesupport-3.2.22.1/lib/active_support/dependencies.rb:236
           require at /home/swapnil/.rvm/gems/jruby-9.0.0.0@JayApp/gems/activesupport-3.2.22.1/lib/active_support/dependencies.rb:251
             <top> at /home/swapnil/.rvm/gems/jruby-9.0.0.0@JayApp/gems/hpricot-0.8.6-java/lib/hpricot.rb:20
           require at org/jruby/RubyKernel.java:940
   block in (root) at /home/swapnil/.rvm/gems/jruby-9.0.0.0@JayApp/gems/bundler-1.11.2/lib/bundler/runtime.rb:1
              each at org/jruby/RubyArray.java:1560
  block in require at /home/swapnil/.rvm/gems/jruby-9.0.0.0@JayApp/gems/bundler-1.11.2/lib/bundler/runtime.rb:77
              each at org/jruby/RubyArray.java:1560
           require at /home/swapnil/.rvm/gems/jruby-9.0.0.0@JayApp/gems/bundler-1.11.2/lib/bundler/runtime.rb:72
           require at /home/swapnil/.rvm/gems/jruby-9.0.0.0@JayApp/gems/bundler-1.11.2/lib/bundler/runtime.rb:61
             <top> at /home/swapnil/.rvm/gems/jruby-9.0.0.0@JayApp/gems/bundler-1.11.2/lib/bundler.rb:99
           require at org/jruby/RubyKernel.java:940
             <top> at /home/swapnil/Rails/Lab/MA-JRuby/trunk/config/application.rb:15
           require at org/jruby/RubyKernel.java:940
             <top> at script/rails:6
@swapab
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swapab commented Mar 24, 2016

hpricot was causing the above error. I removed hpricot from Gemfile.

  • Next error faced.
    NameError: uninitialized constant ActiveRecord::Base::Mysql2

I had monkey patched mysql2_connection.

Looks like Mysql2::Client will no more work since jdbc-mysql is used.

What would be the alternative for Mysql2::Client ?

@headius
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headius commented Mar 24, 2016

What are you using Mysql2::Client for?

We do not have a Java version of the mysql gem yet.

@headius
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headius commented Mar 24, 2016

It looks like you're just using Mysql2::Client to get some configuration parameters. Perhaps the mysql JDBC driver has an equivalent way to set these options?

@swapab
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swapab commented Mar 24, 2016

  • I had an override done on mysql2_connection. Which says:
    Establishes a connection to the database that's used by all Active Record objects

But since mysql2_connection is deprecated it can be ignored 😄

What are you using Mysql2::Client for?

  • I have escaped the quotes in a string using Mysql2::Client.escape. Which actually should have been done in a more abstract rails way.
Solution:

Instead of Mysql2::Client.escape use `ActiveRecord::Base.connection.quote_string

Both should give same results.

jruby

jruby-9.0.5.0 :021 > ActiveRecord::Base.connection.quote_string("O'Malley")
 => "O\\'Malley"

cruby

2.2.1 :005 > Mysql2::Client.escape("O'Malley")
 => "O\\'Malley"

This is great! ❤️ JRuby

@swapab
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swapab commented Mar 24, 2016

I still have this question though. Does this ActiveRecord MULTI_STATEMENTS with mysql2 even work? (Considering ActiveRecord::Base#mysql2_connection is not yet deprecated)

@headius
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headius commented Mar 24, 2016

@swapnilabnave I found this SO post that describes a few ways to get multiple statement support when using JDBC: http://stackoverflow.com/questions/10797794/multiple-queries-executed-in-java-in-single-statement

In any case there's no JRuby bug here so I'm closing this.

@headius headius closed this as completed Mar 24, 2016
@headius headius added this to the Invalid or Duplicate milestone Mar 24, 2016
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