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Azure / azure-iot-sdk-java

A Java SDK for connecting devices to Microsoft Azure IoT services
https://azure.github.io/azure-iot-sdk-java/
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Add support for JDK 1.7 #26

Closed allenhula closed 6 years ago

allenhula commented 7 years ago

Tried to use the jar on JDK 1.7, it is failed. Can you add support for JDK 1.7?

tameraw commented 7 years ago

@allenhula - Thanks for filling this issue. Can you please provide more details on what failed when tried 1.7? Thanks.

allenhula commented 7 years ago

Here is the detailed exception:

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/microsoft/azure/iot/service/sdk/ServiceClient : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at java.lang.Class.getDeclaredFields0(Native Method) at java.lang.Class.privateGetDeclaredFields(Class.java:2436) at java.lang.Class.getDeclaredFields(Class.java:1806) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.findResourceMetadata(CommonAnnotationBeanPostProcessor.java:327) at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(CommonAnnotationBeanPostProcessor.java:286) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyMergedBeanDefinitionPostProcessors(AbstractAutowireCapableBeanFactory.java:870) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:495) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:633) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:83) at com.bosch.escooter.storm.topology.ApplicationStart.main(ApplicationStart.java:27)

tameraw commented 7 years ago

@allenhula - Thanks for the data. I see that you hit that exception when using the Java "Service" SDK with JDK 1.7. Currently we support JDK 1.7 for "Device" SDK side but not for the "Service" SDK yet. If interested in submitting a pull request, we'd happily review that. Thanks!

JMayrbaeurl commented 7 years ago

But the documentation on the first page says: 'Azure IoT Hub Service SDK: enables developing back-end applications for Azure IoT (supports Java 7+)'. Wrong probably! Please fix!

katherb123 commented 7 years ago

Any update on azure IoT Hub device/service SDK support for java 7? Any quick response more appreciated.

prmathur-microsoft commented 7 years ago

@katherb123 - This has been in our backlog for a while but we never had a need to prioritize it. So this has still not been addressed. However we will be happy to take a PR from you if this is of urgent need.

katherb123 commented 7 years ago

Hi prmathur, Please find my pull request: https://github.com/katherb123/iot-service-client/pull/1

prmathur-microsoft commented 6 years ago

@katherb123 - I looked at the PR. Looks like your PR just changes the java version. However compilation won't be successful if we just change the version. There are some features we use from Java 8 which should be reverted to support 1.7 in service client.

timtay-microsoft commented 6 years ago

At the moment, we don't forsee having time to add support for Java 7. Because of that, I'm closing this issue.