從教程中執行cap write_permissions任務時出現NullPointerException

嘗試從Capistrano website執行check_write_permissions任務時，我看到NPE。從教程中執行cap write_permissions任務時出現NullPointerException

舞臺文件本身很簡單：

server "demo.ourapp.com", user: "deployuser", roles: %w{app db web} 

set :branch, "dev" 
set :deployment, "demo" 
set :rails_env, "production" 

role :app, "demo.ourapp.com" 
role :web, "demo.ourapp.com" 
role :db, "demo.ourapp.com", :primary => true 

set :repository, "[email protected]:ouruser/ourapp.git" 

set :deploy_to, "/opt/companyname/ourapp-demo" 

set :puma_bind,  "unix://#{shared_path}/tmp/sockets/#{fetch(:application)}-puma.sock" 
set :puma_state,  "#{shared_path}/tmp/pids/puma.state" 
set :puma_pid,  "#{shared_path}/tmp/pids/puma.pid" 
set :puma_access_log, "#{release_path}/log/puma.error.log" 
set :puma_error_log, "#{release_path}/log/puma.access.log" 
set :puma_preload_app, true 
set :puma_worker_timeout, nil

在執行bundle exec cap deploy this:stage check_write_permissions，我得到以下錯誤：

$ bundle exec cap this:stage check_write_permissions --trace          ‹jruby-9.1.12.0› 
** Invoke this:stage (first_time) 
** Execute this:stage 
** Invoke load:defaults (first_time) 
** Execute load:defaults 
** Invoke bundler:map_bins (first_time) 
** Execute bundler:map_bins 
** Invoke deploy:set_rails_env (first_time) 
** Execute deploy:set_rails_env 
** Invoke deploy:set_linked_dirs (first_time) 
** Execute deploy:set_linked_dirs 
** Invoke deploy:set_rails_env 
** Invoke check_write_permissions (first_time) 
** Execute check_write_permissions 
cap aborted! 
SSHKit::Runner::ExecuteError: Exception while executing as [email protected]: 
/Users/srdjan/.bundle/jruby/2.3.0/gems/sshkit-1.14.0/lib/sshkit/runners/parallel.rb:15:in `block in execute' 
Java::JavaLang::NullPointerException: 
org.jruby.ext.openssl.PKeyEC$Point.initialize(PKeyEC.java:845) 
org.jruby.ext.openssl.PKeyEC$Point$INVOKER$i$0$0$initialize.call(PKeyEC$Point$INVOKER$i$0$0$initialize.gen) 
org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:725) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:368) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:205) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:209) 
org.jruby.RubyClass.newInstance(RubyClass.java:1008) 
org.jruby.RubyClass$INVOKER$i$newInstance.call(RubyClass$INVOKER$i$newInstance.gen) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:208) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:358) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:195) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:323) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:89) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:214) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:200) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:208) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:358) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:195) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:323) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:83) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:179) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:165) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:200) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:161) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:314) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:77) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:144) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:130) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:192) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:129) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:339) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:83) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:179) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:165) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:200) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:161) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:314) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:109) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:95) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:77) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83) 
org.jruby.ir.instructions.CallBase.interpret(CallBase.java:428) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:355) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:132) 
org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(MixedModeIRBlockBody.java:148) 
org.jruby.runtime.IRBlockBody.doYield(IRBlockBody.java:186) 
org.jruby.runtime.BlockBody.yield(BlockBody.java:116) 
org.jruby.runtime.Block.yield(Block.java:165) 
org.jruby.RubyIO.each_lineInternal(RubyIO.java:3282) 
org.jruby.RubyIO.each_line(RubyIO.java:3295) 
org.jruby.RubyIO$INVOKER$i$0$1$each_line.call(RubyIO$INVOKER$i$0$1$each_line.gen) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:298) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:79) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83) 
org.jruby.ir.instructions.CallBase.interpret(CallBase.java:428) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:355) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:132) 
org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(MixedModeIRBlockBody.java:148) 
org.jruby.runtime.IRBlockBody.doYield(IRBlockBody.java:186) 
org.jruby.runtime.BlockBody.yield(BlockBody.java:116) 
org.jruby.runtime.Block.yield(Block.java:165) 
org.jruby.RubyIO.ensureYieldClose(RubyIO.java:1163) 
org.jruby.RubyIO.open(RubyIO.java:1156) 
org.jruby.RubyIO$INVOKER$s$0$0$open.call(RubyIO$INVOKER$s$0$0$open.gen) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:204) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:348) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:173) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:177) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:332) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:132) 
org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(MixedModeIRBlockBody.java:148) 
org.jruby.runtime.IRBlockBody.yieldSpecific(IRBlockBody.java:84) 
org.jruby.runtime.Block.yieldSpecific(Block.java:134) 
org.jruby.ext.thread.Mutex.synchronize(Mutex.java:148) 
org.jruby.ext.thread.Mutex$INVOKER$i$0$0$synchronize.call(Mutex$INVOKER$i$0$0$synchronize.gen) 
org.jruby.internal.runtime.methods.JavaMethod$JavaMethodZeroBlock.call(JavaMethod.java:498) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:77) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83) 
org.jruby.ir.instructions.CallBase.interpret(CallBase.java:428) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:355) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:109) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:95) 
org.jruby.internal.runtime.methods.AliasMethod.call(AliasMethod.java:101) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:298) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:79) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83) 
org.jruby.ir.instructions.CallBase.interpret(CallBase.java:428) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:355) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:77) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:144) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:130) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:192) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:318) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:131) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:339) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:83) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:179) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:165) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:200) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:338) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:314) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:132) 
org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(MixedModeIRBlockBody.java:148) 
org.jruby.runtime.IRBlockBody.doYield(IRBlockBody.java:186) 
org.jruby.runtime.BlockBody.yield(BlockBody.java:116) 
org.jruby.runtime.Block.yield(Block.java:165) 
org.jruby.RubyArray.collect(RubyArray.java:2472) 
org.jruby.RubyArray.map19(RubyArray.java:2486) 
org.jruby.RubyArray$INVOKER$i$0$0$map19.call(RubyArray$INVOKER$i$0$0$map19.gen) 
org.jruby.internal.runtime.methods.JavaMethod$JavaMethodZeroBlock.call(JavaMethod.java:498) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:298) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:79) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83) 
org.jruby.ir.instructions.CallBase.interpret(CallBase.java:428) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:355) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:89) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:214) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:200) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:208) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:358) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:195) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:323) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:77) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:144) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:130) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:192) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:318) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:131) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:339) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:77) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:144) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:130) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:192) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:318) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:131) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:339) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:89) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:214) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:200) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:368) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:205) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:209) 
org.jruby.RubyClass.newInstance(RubyClass.java:1008) 
org.jruby.RubyClass$INVOKER$i$newInstance.call(RubyClass$INVOKER$i$newInstance.gen) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:208) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:358) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:195) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:323) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:89) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:214) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:200) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:368) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:205) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:209) 
org.jruby.RubyClass.newInstance(RubyClass.java:1008) 
org.jruby.RubyClass$INVOKER$i$newInstance.call(RubyClass$INVOKER$i$newInstance.gen) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:208) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:358) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:195) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:323) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:109) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:95) 
org.jruby.RubyMethod.call(RubyMethod.java:127) 
org.jruby.RubyMethod$INVOKER$i$call.call(RubyMethod$INVOKER$i$call.gen) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:298) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:79) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83) 
org.jruby.ir.instructions.CallBase.interpret(CallBase.java:428) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:355) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:109) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:95) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:298) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:79) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83) 
org.jruby.ir.instructions.CallBase.interpret(CallBase.java:428) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:355) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:109) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:95) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:298) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:79) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83) 
org.jruby.ir.instructions.CallBase.interpret(CallBase.java:428) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:355) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:83) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:179) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:165) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:200) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:338) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:314) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:132) 
org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(MixedModeIRBlockBody.java:148) 
org.jruby.runtime.IRBlockBody.doYield(IRBlockBody.java:186) 
org.jruby.runtime.BlockBody.yield(BlockBody.java:116) 
org.jruby.runtime.Block.yield(Block.java:165) 
org.jruby.RubyKernel.tap(RubyKernel.java:1747) 
org.jruby.RubyKernel$INVOKER$s$0$0$tap.call(RubyKernel$INVOKER$s$0$0$tap.gen) 
org.jruby.internal.runtime.methods.JavaMethod$JavaMethodZeroBlock.call(JavaMethod.java:498) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:298) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:79) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:83) 
org.jruby.ir.instructions.CallBase.interpret(CallBase.java:428) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:355) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:89) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:214) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:200) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:208) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:358) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:195) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:323) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:83) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:179) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:165) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:200) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:338) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:163) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:314) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:132) 
org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(MixedModeIRBlockBody.java:148) 
org.jruby.runtime.IRBlockBody.doYield(IRBlockBody.java:193) 
org.jruby.runtime.BlockBody.yield(BlockBody.java:125) 
org.jruby.runtime.Block.yieldNonArray(Block.java:169) 
org.jruby.RubyBasicObject.yieldUnder(RubyBasicObject.java:1751) 
org.jruby.RubyBasicObject.instance_exec19(RubyBasicObject.java:1728) 
org.jruby.RubyBasicObject$INVOKER$i$0$3$instance_exec19.call(RubyBasicObject$INVOKER$i$0$3$instance_exec19.gen) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:204) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:348) 
org.jruby.runtime.callsite.CachingCallSite.callBlock(CachingCallSite.java:173) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:177) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:332) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:77) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:144) 
org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:130) 
org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:192) 
org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:318) 
org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:131) 
org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:339) 
org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:73) 
org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:132) 
org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(MixedModeIRBlockBody.java:148) 
org.jruby.runtime.IRBlockBody.call(IRBlockBody.java:73) 
org.jruby.runtime.Block.call(Block.java:124) 
org.jruby.RubyProc.call(RubyProc.java:289) 
org.jruby.RubyProc.call(RubyProc.java:246) 
org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:104) 
java.lang.Thread.run(Thread.java:745) 
Tasks: TOP => check_write_permissions

我使用JRuby 9.1.12.0，Capistrano的3.8.2。我對這些信息進行了匿名處理，但deployuser確實具有無密碼SSH訪問權限。

任何幫助，非常感謝。

來源

2017-07-07 Srdjan Pejic

跨發佈到https://github.com/capistrano/sshkit/issues/405 – robd

一種org.jruby.ext.openssl.PKeyEC$Point.initialize(PKeyEC.java:845)搜索打開了這一點：https://github.com/jruby/jruby-openssl/issues/105這表明這是一個解決辦法：

Net::SSH::Transport::Algorithms::ALGORITHMS.values.each { |algs| algs.reject! { |a| a =~ /^ecd(sa|h)-sha2/ } } 
Net::SSH::KnownHosts::SUPPORTED_TYPE.reject! { |t| t =~ /^ecd(sa|h)-sha2/ }

這是否幫助呢？

來源

2017-07-07 18:17:55 robd

這最終幫助。謝謝@robd –

將這兩行添加到deploy.rb中對我有所幫助。謝謝。 –

從教程中執行cap write_permissions任務時出現NullPointerException

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