jhades / ng2-minimal Goto Github PK

A beginner-friendly playground for getting started with Angular 2, Typescript and SystemJs - includes bundling

HTML 21.54% TypeScript 16.01% JavaScript 62.45%

ng2-minimal's Introduction

JHades - Your way out of Jar Hell!

JHades is a Java classpath troubleshooting tool. It helps to solve common Java classpath / Jar Hell related problems such as ClassNotFoundException, NoClassDefFoundError, ClassCastException, NoSuchMethodException, LinkageError, etc.

It allows to query the classpath for class duplicates, find specific resource locations, etc.

Documentation available at http://jhades.github.io

Example of a classpath problem

Let's say a java web application works fine in development, but when deploying it to a server the following problem occurs:


java.lang.ClassCastException: org.apache.bval.jsr303.ApacheValidationProvider cannot be cast to javax.validation.spi.ValidationProvider
	javax.validation.Validation$DefaultValidationProviderResolver.getValidationProviders(Validation.java:332)
	javax.validation.Validation$GenericBootstrapImpl.configure(Validation.java:256)
	javax.validation.Validation.buildDefaultValidatorFactory(Validation.java:111)
	classloaders.test.TestServlet.doGet(TestServlet.java:33)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:91)

How to troubleshoot

JHades provides several commands that allow to extract from the runtime environment a lot of information which is important for understanding what is going on. Namelly these types of questions can be answered:

are there any overlapping jars, with different versions of the same class?
Are those multiple versions of the same class all identical or not ?
where are the different versions of a given class located ?
which class loader is loading which version of a given class ?
What does the chain of classloaders look like, how are the classloaders configured ?

This is an example of how to answer several of these questions for the sample problem above:

 
 new JHades()
	.printClassLoaders()
	.printClasspath()
	.overlappingJarsReport()
	.multipleClassVersionsReport()
	.findClassByName("org.apache.bval.jsr303.ApacheValidationProvider")
	.findClassByName("javax.validation.spi.ValidationProvider");

Jar overlap report

One of the most common sources of classpath problems are overlapping jar files, that contain multiple versions of the same class:


>>>> Jar overlap report: 
 
aspectjrt-1.7.2.jar overlaps with aspectjweaver-1.7.2.jar - total overlapping classes: 129
ejb3-persistence-1.0.2.GA.jar overlaps with hibernate-jpa-2.0-api-1.0.1.Final.jar - total overlapping classes: 91
stax-api-1.0-2.jar overlaps with xml-apis-1.4.01.jar - total overlapping classes: 34
javax.xml.soap-api-1.3.5.jar overlaps with saaj-api-1.3.jar - total overlapping classes: 29
commons-beanutils-1.8.3.jar overlaps with commons-collections-3.2.1.jar - total overlapping classes: 10
xbean-2.2.0.jar overlaps with xml-apis-1.4.01.jar - total overlapping classes: 6
commons-logging-1.1.1.jar overlaps with jcl-over-slf4j-1.6.6.jar - total overlapping classes: 6
 
Total number of classes with more than one version: 305

Check http://jhades.github.io for more details.

ng2-minimal's People

Contributors

Stargazers

Watchers

Forkers

thanood maxtuzz npelkone wcainboundary

ng2-minimal's Issues

not working while running npm start command - log attached

0 info it worked if it ends with ok
1 verbose cli [ 'C:\Program Files\nodejs\node.exe',
1 verbose cli 'C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js',
1 verbose cli 'start' ]
2 info using [email protected]
3 info using [email protected]
4 verbose run-script [ 'prestart', 'start', 'poststart' ]
5 info prestart [email protected]
6 info start [email protected]
7 verbose unsafe-perm in lifecycle true
8 info [email protected] Failed to exec start script
9 verbose stack Error: [email protected] start: npm-run-all build-ts build-lib -p watch serve
9 verbose stack Exit status 1
9 verbose stack at EventEmitter. (C:\Program Files\nodejs\node_modules\npm\lib\utils\lifecycle.js:217:16)
9 verbose stack at emitTwo (events.js:87:13)
9 verbose stack at EventEmitter.emit (events.js:172:7)
9 verbose stack at ChildProcess. (C:\Program Files\nodejs\node_modules\npm\lib\utils\spawn.js:24:14)
9 verbose stack at emitTwo (events.js:87:13)
9 verbose stack at ChildProcess.emit (events.js:172:7)
9 verbose stack at maybeClose (internal/child_process.js:827:16)
9 verbose stack at Process.ChildProcess._handle.onexit (internal/child_process.js:211:5)
10 verbose pkgid [email protected]
11 verbose cwd C:\Users\Mahi\Desktop\angular2
12 error Windows_NT 6.3.9600
13 error argv "C:\Program Files\nodejs\node.exe" "C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" "start"
14 error node v4.4.4
15 error npm v2.15.1
16 error code ELIFECYCLE
17 error [email protected] start: npm-run-all build-ts build-lib -p watch serve
17 error Exit status 1
18 error Failed at the [email protected] start script 'npm-run-all build-ts build-lib -p watch serve '.
18 error This is most likely a problem with the ng2-minimal package,
18 error not with npm itself.
18 error Tell the author that this fails on your system:
18 error npm-run-all build-ts build-lib -p watch serve
18 error You can get information on how to open an issue for this project with:
18 error npm bugs ng2-minimal
18 error Or if that isn't available, you can get their info via:
18 error
18 error npm owner ls ng2-minimal
18 error There is likely additional logging output above.
19 verbose exit [ 1, true ]

npm run server yields the following error

C:\Learning\angular-course-3-services-finished>npm run server

[email protected] server
node_modules/.bin/ts-node -P ./server.tsconfig.json ./server.ts

'node_modules' is not recognized as an internal or external command,
operable program or batch file.

Error running npm start: '.' is not recognized as an internal or external command

From the scripts section of package.json, this line looks suspect to me:
"serve": "./node_modules/.bin/http-server -c-1 ."

Here's the full output of "npm start":

'.' is not recognized as an internal or external command, operable program or batch file.

npm ERR! Windows_NT 6.1.7601
npm ERR! argv "C:\Program Files\nodejs\node.exe" "C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" "run-script" "watch"
npm ERR! node v6.1.0
npm ERR! npm v3.8.6
npm ERR! code ELIFECYCLE
npm ERR! [email protected] watch: ./node_modules/.bin/nodemon -V -w src --ext ".ts" --exec "npm run build-app"
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] watch script ' ./node_modules/.bin/node mon -V -w src --ext ".ts" --exec "npm run build-app"'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the ng2-minimal package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! ./node_modules/.bin/nodemon -V -w src --ext ".ts" --exec "npm run build-app"
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs ng2-minimal
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls ng2-minimal
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! C:\Users***\Source\GitHub\ng2-minimal\npm-debug.log
ERROR: watch: None-Zero Exit(1);

npm ERR! Windows_NT 6.1.7601
npm ERR! argv "C:\Program Files\nodejs\node.exe" "C:\Program Files\nodejs\node_modules\npm\bin\npm-cli.js" "start"
npm ERR! node v6.1.0
npm ERR! npm v3.8.6
npm ERR! code ELIFECYCLE
npm ERR! [email protected] start: npm-run-all build-ts build-lib -p watch serve
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] start script 'npm-run-all build-ts build-lib -p watch serve '.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the ng2-minimal package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! npm-run-all build-ts build-lib -p watch serve
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs ng2-minimal
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls ng2-minimal
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! C:\Users***\Source\GitHub\ng2-minimal\npm-debug.log

jhades / ng2-minimal Goto Github PK

ng2-minimal's Introduction

JHades - Your way out of Jar Hell!

Example of a classpath problem

How to troubleshoot

Jar overlap report

ng2-minimal's People

Contributors

Stargazers

Watchers

Forkers

ng2-minimal's Issues

not working while running npm start command - log attached

npm run server yields the following error

Error running npm start: '.' is not recognized as an internal or external command

Recommend Projects

React

Vue.js

Typescript

TensorFlow

Django

Laravel

D3

Recommend Topics

javascript

web

server

Machine learning

Visualization

Game

Recommend Org

Facebook

Microsoft

Google

Alibaba

D3

Tencent