Bug#893495: openhft-lang FTBFS with openjdk-9

[Adrian Bunk]

Source: openhft-lang
Version: 6.7.6-1
Severity: serious
Tags: buster sid

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/openhft-lang.html

...
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /build/1st/openhft-lang-6.7.6/lang/src/main/java/net/openhft/lang/io/VanillaMappedBytes.java:[18,16] cannot find symbol
  symbol:   class Cleaner
  location: package sun.misc
[ERROR] /build/1st/openhft-lang-6.7.6/lang/src/main/java/net/openhft/lang/io/AbstractMappedStore.java:[31,16] cannot find symbol
  symbol:   class Cleaner
  location: package sun.misc
[ERROR] /build/1st/openhft-lang-6.7.6/lang/src/main/java/net/openhft/lang/io/AbstractMappedStore.java:[42,19] cannot find symbol
  symbol:   class Cleaner
  location: class net.openhft.lang.io.AbstractMappedStore
[ERROR] /build/1st/openhft-lang-6.7.6/lang/src/main/java/net/openhft/lang/io/IOTools.java:[22,16] cannot find symbol
  symbol:   class Cleaner
  location: package sun.misc
[ERROR] /build/1st/openhft-lang-6.7.6/lang/src/main/java/net/openhft/lang/io/DirectStore.java:[25,16] cannot find symbol
  symbol:   class Cleaner
  location: package sun.misc
[ERROR] /build/1st/openhft-lang-6.7.6/lang/src/main/java/net/openhft/lang/io/DirectStore.java:[35,19] cannot find symbol
  symbol:   class Cleaner
  location: class net.openhft.lang.io.DirectStore
[ERROR] /build/1st/openhft-lang-6.7.6/lang/src/main/java/net/openhft/lang/io/VanillaMappedBytes.java:[95,13] cannot find symbol
  symbol:   class Cleaner
  location: class net.openhft.lang.io.VanillaMappedBytes
[ERROR] /build/1st/openhft-lang-6.7.6/lang/src/main/java/net/openhft/lang/io/AbstractMappedStore.java:[62,28] cannot find symbol
  symbol:   variable Cleaner
  location: class net.openhft.lang.io.AbstractMappedStore
[ERROR] /build/1st/openhft-lang-6.7.6/lang/src/main/java/net/openhft/lang/io/IOTools.java:[85,13] cannot find symbol
  symbol:   class Cleaner
  location: class net.openhft.lang.io.IOTools
[ERROR] /build/1st/openhft-lang-6.7.6/lang/src/main/java/net/openhft/lang/io/DirectStore.java:[65,19] cannot find symbol
  symbol:   variable Cleaner
  location: class net.openhft.lang.io.DirectStore