Mitigation for wrongly reused transactions

[felixbarny]

see #178

[felixbarny]

Here is a snapshot build for this fix: elastic-apm-agent-0.7.0-SNAPSHOT.jar.zip

[codecov-io]

Codecov Report

Merging #180 into master will decrease coverage by 0.04%.
The diff coverage is 70.37%.

@@             Coverage Diff              @@
##             master     #180      +/-   ##
============================================
- Coverage     72.62%   72.58%   -0.05%     
- Complexity     1055     1059       +4     
============================================
  Files           118      118              
  Lines          4081     4096      +15     
  Branches        391      394       +3     
============================================
+ Hits           2964     2973       +9     
- Misses          930      933       +3     
- Partials        187      190       +3

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/co/elastic/apm/impl/transaction/Span.java	93.75% <100%> (-0.13%)	19 <0> (ø)
.../co/elastic/apm/impl/transaction/AbstractSpan.java	71.64% <100%> (+0.42%)	21 <0> (ø)	⬇️
.../java/co/elastic/apm/report/ApmServerReporter.java	55.05% <50%> (-0.12%)	11 <1> (ø)
...ain/java/co/elastic/apm/impl/ElasticApmTracer.java	73.1% <58.33%> (-2.81%)	41 <2> (+1)
...stic/apm/objectpool/impl/QueueBasedObjectPool.java	36.36% <66.66%> (+3.03%)	7 <2> (+1)	⬆️
...a/co/elastic/apm/impl/transaction/Transaction.java	78.75% <83.33%> (+0.54%)	24 <3> (+1)	⬆️
...stic/apm/report/IntakeV1ReportingEventHandler.java	77.77% <0%> (+4.44%)	13% <0%> (+1%)	⬆️

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[felixbarny]

@Aketzu could you give this snapshot another try? elastic-apm-agent-0.7.0-SNAPSHOT.jar.zip

Maybe the AtomicReferenceArray in Java 1.7 contains a bug which leads to this situation.

[felixbarny]

Corresponding snapshot: elastic-apm-agent-0.7.0-SNAPSHOT.jar.zip

[felixbarny]

Current snapshot: elastic-apm-agent-0.7.0-SNAPSHOT.jar.zip

[felixbarny]

superseded by #205