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OutOfMemoryError in StringBuilder.append() even with more than enough memory

I get an OutOfMemoryError from java.lang.StringBuilder.append even when I set the memory size to 32 GB and reading only a 500 MB file into the builder.

java.lang.OutOfMemoryError: null
    at java.base/java.lang.AbstractStringBuilder.hugeCapacity(AbstractStringBuilder.java:214) ~[na:na]
    at java.base/java.lang.AbstractStringBuilder.newCapacity(AbstractStringBuilder.java:206) ~[na:na]
    at java.base/java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:173) ~[na:na]
    at java.base/java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:538) ~[na:na]
    at java.base/java.lang.StringBuilder.append(StringBuilder.java:174) ~[na:na]
    at com.github.loa.indexer.service.index.base64.Base64Encoder.encode(Base64Encoder.java:31) ~[classes/:na]

发生这种情况是因为StringBuilder要分配的字节数组将需要比JVM允许的更大的数组大小(超过2147483647个aka Integer.MAX_VALUE元素)。

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