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OSGi: What are the differences between Apache Felix and Apache Karaf?
...es are the features added by Karaf:
Therefore, unless you have specific needs which are not met by Karaf (requiring access to the underlying implementation) it usually makes sense to use this since it provides more 'out of the box'.
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How to fluently build JSON in Java?
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See the Java EE 7 Json specification.
This is the right way:
String json = Json.createObjectBuilder()
.add("key1", "value1")
.add("key2", "value2")
.build()
.toString();
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File path to resource in our war/WEB-INF folder?
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It's worth pointing out that I needed to put an initial / in the path to get this to work, like this: context.getResourceAsStream("/WEB-INF/test/foo.txt");
– Mick Sear
Jun 16 '11 at 15:06
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What is javax.inject.Named annotation supposed to be used for?
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Use @Named to differentiate between different objects of the same type bound in the same scope.
@Named("maxWaitTime")
public long maxWaitTimeMs;
@Named("minWaitTime")
public long minWaitTimeMs;
Without the @Named qualifier, the injector would not know ...
Maven dependency for Servlet 3.0 API?
... understand why but never mind...
Brabster separate dependencies have been replaced by Java EE 6 Profiles. Is there a source that confirms this assumption?
The maven repository from Java.net indeed offers the following artifact for the WebProfile:
<repositories>
<repository>
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Can I change the checkbox size using CSS?
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this seems to be the correct answer as the one marked as answer offers no solutions in many cases (no solution to firefox on xp? no chrome at all?), is outdated and only contains a link and a comment of not much value.
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What's the best way to validate an XML file against an XSD file?
I'm generating some xml files that needs to conform to an xsd file that was given to me. What's the best way to verify they conform?
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Spring Expression Language (SpEL) with @Value: dollar vs. hash ($ vs. #)
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Re: comment above - also see this answer
– Steve Chambers
Apr 25 '18 at 14:54
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Dynamically Changing log4j log level
...og4j will automatically refresh the log levels according to your changes. See the documentation of org.apache.log4j.xml.DOMConfigurator.configureAndWatch(String,long) for details. The default wait time between checks is 60 seconds. These changes would be persistent, since you directly change the con...
Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...里都有提及，本文就不赘述了，这里着重与快速上手。
安装配置
我以CentOS为例，说明如何通过RPM来安装Rsyslog：
shell> cd /etc/yum.repos.d/
shell> wget http://rpms.adiscon.com/v8-stable/rsyslog.repo
shell> yum install rsyslog
安装完成后，我们可以...