Labels from DB using Spring Boot

asked 2021-09-16 20:38:57 +0800

FGabbr gravatar image FGabbr
3 1

I'm using ZK 6.5 and trying to load labels from DB using SpringBoot, but the DI does not seem to work inside the LabelLocator (instantiated by a WebAppInit listener)

What is the correct way? This gives NullPointer:

class DBLabelLocator implements LabelLocator2 {

    LabelService labelService

    InputStream locate(Locale locale) {
        StringBuilder data = new StringBuilder()
        for (MyLabel label : labelService.listAll())
        log.info("Labels: \n {}", data.toString())
        return new ByteArrayInputStream(data.toString().getBytes(getCharset()))
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answered 2021-09-17 10:14:17 +0800

cor3000 gravatar image cor3000
6280 2 7

updated 2021-09-17 10:15:22 +0800

The question is: How do you instantiate the DBLabelLocator inside your WebAppInit?

Annotations don't do anything by themselves. So you need to ask Spring to create the bean for you. E.g. (pseudo code, not tested just highlighting the principle)

in your WebAppInit:

public void init(WebApp wapp) {
    // get spring's application context
    ApplicationContext ctx = WebApplicationContextUtils

    // ask for a bean by type
    LabelLocator2 dbLabelLocator = ctx.getBean(DBLabelLocator.class);

    // register the locator with ZK

if you just say new DBLabelLocator() spring won't process the annotations @Service/@Transactional/@Autowired. However you forgot to provide that code so my initial guess might just be wrong ... please specify the details if needed.

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class WebAppInit implements org.zkoss.zk.ui.util.WebAppInit {

    DBLabelLocator dbLabelLocator

    void init(WebApp webApp) throws Exception {

both your solution and this do not work

FGabbr ( 2021-09-17 18:55:37 +0800 )edit

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'config.DBLabelLocator': Unsatisfied dependency expressed through bean property 'metaClass': Set this property value or disable dependency checking for this bean.

FGabbr ( 2021-09-17 19:17:18 +0800 )edit


LabelLocator2 dbLabelLocator = ctx.autowireCapableBeanFactory.autowire(DBLabelLocator.class, Autowire.BY_TYPE.value(), false)

in place of ctx.getBean seam to work! Thanks for your answer, it helped getting there!

FGabbr ( 2021-09-17 19:24:01 +0800 )edit
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Asked: 2021-09-16 20:38:57 +0800

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Last updated: Sep 17 '21

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