Multi branch pipeline: How to read global environment variables?

[shan]

What is a proper way to read environment variables for multi branch pipeline?

Right now, I am reading an env.properties file kept in jenkins workspace, and then populating my global env.

def readEnvVars(envFile) {
    def props = new Properties()
    def fis = new FileInputStream(envFile)
    props.load(fis)
    return props
}
node {
// write into global env variables
def props = readEnvVars('env.properties')
env.DATABASE = props.DATABSE
// and more global env variable
}

I am not that happy with this approach. Still, I can live with it. But this throws error in case of multi branch, but works for single branch pipeline.

Error stack trace:

groovy.lang.MissingPropertyException: No such property: props for class: groovy.lang.Binding
        at groovy.lang.Binding.getVariable(Binding.java:63)
        at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onGetProperty(SandboxInterceptor.java:224)
        at org.kohsuke.groovy.sandbox.impl.Checker$4.call(Checker.java:241)
        at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:238)
        at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:221)
        at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.getProperty(SandboxInvoker.java:23)
        at com.cloudbees.groovy.cps.impl.PropertyAccessBlock.rawGet(PropertyAccessBlock.java:17)
        at WorkflowScript.run(WorkflowScript:75)
        at ___cps.transform___(Native Method)
        at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.get(PropertyishBlock.java:62)
        at com.cloudbees.groovy.cps.LValueBlock$GetAdapter.receive(LValueBlock.java:30)
        at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.fixName(PropertyishBlock.java:54)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
        at com.cloudbees.groovy.cps.impl.ConstantBlock.eval(ConstantBlock.java:21)
        at com.cloudbees.groovy.cps.Next.step(Next.java:58)
        at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:154)
        at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:18)
        at org.jenkinsci.plugins.workflow.cps.SandboxContinuable$1.call(SandboxContinuable.java:32)
        at org.jenkinsci.plugins.workflow.cps.SandboxContinuable$1.call(SandboxContinuable.java:29)
        at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.GroovySandbox.runInSandbox(GroovySandbox.java:108)
        at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:29)
        at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:164)
        at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:276)
        at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$000(CpsThreadGroup.java:78)
        at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:185)
        at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:183)
        at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:47)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:112)
        at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.run(FutureTask.java:262)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)

I am not able to figure out what's going wrong.

[shan]

There is a typo:

env.DATABASE = props.DATABASE